́of Defense Equipment Oil Analysis Program. Consultation on standards has been provided, and measurements of physical properties of base oil, concentrations of major elements in standards, concentrations of trace contaminants, and stability of solutions have been performed. Results of studies accomplished in fiscal year 1972 are detailed in this report.

TN752. Directory of law enforcement and criminal justice associations and research centers, B. J. Latka, Nat. Bur. Stand. (U.S.), Tech. Note 752, 49 pages (June 1973) 80 cents, SD Catalog No. C13.46:752.

Key words: Associations; criminal justice; directory, law enforcement; research centers.

This directory lists national, non-profit professional and volunteer social action associations and research centers which are active in the fields of law enforcement and criminal justice. The International and foreign organizations which are listed either have a large number of American members, have a United States chapter, or are doing work which is applicable to the United States. The local organizations which are listed either cover several states or are of national interest. The organizations are listed alphabetically with a subject index included. The format of an entry is: title of organization; mailing address; officer; telephone number; year when founded; number of members, number of staff; description of purpose and activities; affiliations; publications, meetings.

TN753. NBS Special Foreign Currency Program in Yugoslavia 1971-72, H. S. Peiser, S. E. Chappell, E. Horowitz, H. Yakowitz, and D. Bluebond, Nat. Bur. Stand. (U.S.), Tech. Note 753, 72 pages (Jan. 1973) 90 cents, SD Catalog No. C13.46:753.

Key words: Binational research cooperation; international scientific cooperation; physical science research administration; research planning; scientific research abstracts; Special Foreign Currency Program; Yugoslavia science and technology.

An overview is given of grants awarded by the National Bureau of Standards under the Special Foreign Currency Program (SFCP) in Yugoslavia, authorized by Public Law 480 and other legislation. Each grant is identified by title, principal investigator, institution in Yugoslavia, NBS monitor, and the monitor's organizational unit within NBS. The work is then described briefly under the three headings "Summary Description of Project Goals," "Results and Implications to Date" and "List of Publications that Resulted from the Project." To demonstrate the relevance of such grants to the programs of NBS, the grant descriptions are ordered by the elements of that Program Structure. The significance and purpose of the NBS/SFCP grant program are discussed in the Foreword, the Introduction and an Appendix. The NBS monitors and the program manager judge this grant program to have had a high benefit to cost ratio from the viewpoint of NBS.

TN754. Methods of measurement for semiconductor materials, process control, and devices. Quarterly report July 1 to September 30, 1972, W. M. Bullis, Editor, Nat. Bur. Stand. (U.S.), Tech. Note 754, 55 pages (Mar. 1973) 80 cents, SD Catalog No. C13.46:754.

Key words: Aluminum wire; base transit time; carrier lifetime; die attachment; electrical properties; epitaxial silicon; gamma-ray detectors; generation centers; germanium; gold-doped silicon; infrared response; methods of measurement; microelectronics; microwave diodes; nuclear radiation detectors; probe techniques (a-c); recombination cen

ters; resistivity; ribbon wire bonding; semiconductor devices; semiconductor materials; semiconductor process control; silicon; thermal resistance; trapping centers; ultrasonic bonding; wire bonds.

This quarterly progress report, seventeenth of a series, describes NBS activities directed toward the development of methods of measurement for semiconductor materials, process control, and devices. Significant accomplishments during this reporting period include design of a plan to provide standard silicon wafers for four-probe resistivity measurements for the industry, publication of a summary report on the photoconductive decay method for measuring carrier lifetime, publication of a comprehensive review of the field of wire bond fabrication and testing, and successful completion of organizational activity leading to the establishment of a new group on quality and hardness assurance in ASTM Committee F-1 on Electronics. Work is continuing on measurement of resistivity of semiconductor crystals; characterization of generation-recombination-trapping centers in silicon; study of gold-doped silicon; development of the infrared response technique; evaluation of wire bonds and die attachment; and measurement of thermal properties of semiconductor devices, delay time and related carrier transport properties in junction devices, and noise properties of microwave diodes. New efforts were initiated in both the die attachment and wire bond evaluation tasks. Supplementary data concerning staff, standards committee activities, technical services, and publications are included as appendixes. A description of breakdown tracks, a primary failure mode of monolithic integrated circuits stressed with voltage pulses, is given in a separate appendix.

TN755. Some aspects of the setting and hardening of gypsum plaster, J. R. Clifton, Nat. Bur. Stand. (U.S.), Tech. Note 755, 33 pages (Jan. 1973) 55 cents, SD Catalog No. C13.46:755.

Key words: Colloidal theory; crystallization theory; gypsum; hydration; induction period; plaster of paris; setting mechanisms.

The mechanisms by which gypsum plaster sets and hardens have been investigated and the results generally are consistent with the crystallization theory. No evidence for the presence of colloidal intermediates has been found. The crystallization theory is modified to include, as an intermediate species, solvated calcium sulfate hemihydrate molecules. Evidence is presented that supports the belief that more than one reaction is responsible for the setting and hardening of gypsum plaster.

The roles of accelerators and retarders have been studied by calorimetric, differential thermal analysis, and scanning electron microscopic techniques. The cation is more effective than the anion in accelerating the setting and hardening of gypsum plasters; the catalytic order follows the sequence M+ M2+ M3+. Small amounts of retarders can severely retard the setting and hardening processes.

Influences of temperature, impurities, and production conditions on the setting rates of gypsum plasters are discussed. TN756. A user's guide to the OMNITAB command "STATISTICAL ANALYSIS," H. H. Ku, Nat. Bur. Stand. (U.S.), Tech. Note 756, 44 pages (Mar. 1973) 75 cents, SD Catalog No. C13.46:756.

Key words: Computing, statistical; documentation for users; OMNITAB; statistics.

This Technical Note is the first of a series of interpretive notes for a number of commands in the OMNITAB system that have the automatic printout feature. Others planned in the series in

clude commands FIT and POLYFIT, TWOWAY analysis, ONEWAY analysis, and CORRELATION.

These notes aim to be self-contained so that users may have sufficient information on hand for the understanding of the statistics computed and to use them for their immediate applications. Computation formulas are given in the text, and a number of statistical tables are reproduced in the Appendix for the convenience of users.

TN757. The smoke density chamber method for evaluating the potential smoke generation of building materials, T. G. Lee, Nat. Bur. Stand. (U.S.), Tech. Note 757, 20 pages (Jan. 1973) 45 cents, SD Catalog No. C13.46:757.

Key words: Building materials; fire; fire services; smoke; smoke density chamber; smoke potential; test method; visibility.

The paper reviews the Smoke Density Chamber Test Method and illustrates its use and application to assess smoke generation of building materials in fire situations. It shows how test results may aid the Fire Services and code authorities in evaluating and reducing the potential light-obscuration hazard of smoke in buildings. An example is given for calculating visibility in a simplified fire situation involving material of known smoke generation. The smoke generation of some common interior finish and construction materials is given.

TN758. NBS reactor: Summary of activities October 1971 to September 1972, R. S. Carter, Editor, Nat. Bur. Stand. (U.S.), Tech. Note 758, 140 pages (Mar. 1973) $2.10, SD Catalog No. C13.46:758.

Key words: Activation analysis; crystal structure; diffraction; isotopes; molecular dynamics; neutron; nuclear reactor; radiation.

This report summarizes all those programs which depend on the NBS reactor. It covers the period from October 1971 through September 1972. The programs range from the use of neutron beams to study the structure and dynamics of materials through nuclear physics and neutron standards to sample irradiations for activation analysis, isotope production, and radiation effects studies.

TN759. The NBS lead paint poisoning project: Housing and other aspects, H. W. Berger, Nat. Bur. Stand. (U.S.), Tech. Note 759, 25 pages (Feb. 1973) 30 cents, SD Catalog No. C13.46:759.

Key words: Hazard elimination; lead analysis; lead paint; lead poisoning.

The National Bureau of Standards is providing technical support required by the Department of Housing and Urban Development to carry out its research responsibilities under PL 91-695, The Lead Based Paint Poisoning Prevention Act. The program at NBS has involved three major areas of research: (1) an estimation of the numbers of children at risk and with excessive body burdens of lead and the geographical distribution of those children; (2) the capabilities and characteristics of analytical methods for the detection of lead in paint and other building materials; and (3) the identification and evaluation of materials, techniques and systems for removing or eliminating the lead paint hazard from housing. This paper is a brief presentation of the activities and conclusions of NBS in the areas listed above.

TN760. Description of the magnetic tape version of the Bulletin of Thermodynamics and Thermochemistry, No. 14 (1971), R. McClenon, W. H. Evans, D. Garvin, and B. C. Duncan, Nat. Bur. Stand. (U.S.), Tech. Note 760, 51 pages (Mar. 1973) 75 cents, SD Catalog No. C13.46:760.

Key words: Bibliography; chemical thermodynamics; extended character codes; information retrieval; magnetic tape.

The substance-property index and bibliography sections of the Bulletin of Thermodynamics and Thermochemistry, No. 14 (May 1971) have been converted to a magnetic tape version designed for computerized searching written in an extended form of the American National Standard Code for Information Interchange (X 3.4-1968). In this version each substance-property entry has been supplemented by a searching key. This report describes the magnetic tape version.

TN761. Project SOAP: A systems approach to biomedical research program management-A case study, R. S. Cutler, Nat. Bur. Stand. (U.S.), Tech. Note 761, 75 pages (Apr. 1973) 95 cents, SD Catalog No. C13.46:761.

Key words: Biomedical research; "health relevance"; program planning and budgeting; R&D management; systems analysis; systems approach.

This case study describes the activities of an interagency task group that applied systems analysis to improve management controls within a biomedical research agency of the federal government. The results were the formulation and implementation of a discipline for program management, which explicitly makes use of multiple criteria in arriving at resource allocation decisions.

The text details the necessary preliminary analysis describing operational activities, information flows, and key decision points within the organization. It goes on to identify the techniques employed and the difficulties encountered while attempting to improve the decision-making process for selecting research projects, under conditions of reduced funding. In particular, a comparison is made between: (1) the agency's traditional singlecriterion "peer review” judgment for determining budget priorities, and (2) the multiple-criteria judgments required to effect more positive management control. The systematic use of separate "scientific merit" and "health relevance" ratings is compared with the organization's actual experience. The criteria used by various participants in the decision process are analyzed, and a dollar allocation "investment” procedure based on these findings is developed.

A procedure which organizes relevant information for research program planning and evaluation is presented, and extension of this recommended procedure to wider use by science administrators elsewhere in government is discussed.

TN762. Tabulation of voluntary standards and certification programs for consumer products, S. J. Chumas, Nat. Bur. Stand. (U.S.), Tech. Note 762, 119 pages (Mar. 1973) $1.25, SD Catalog No. C13.46:762.

Key words: Certification programs; consumer products; household products; industry standards; international recommendations; national standards; product standards; recommended practices; specifications; test methods.

This tabulation is a revised and enlarged version of NBS Technical Note 705, "Tabulation of Voluntary National Standards, Industry Standards, International Recommendations and Certification Programs for Consumer Products," issued December 1971.

Technical Note 705 was a revision of the Draft Tabulation compiled by the American National Standards Institute and issued in April 1970. The categories and products covered in the tabulation were originally based on those listed in the Consumer Product Safety Index (CPSI) of the National Commission on Product Safety, published in July 1970. The products and categories in the current revision are based on those developed

for the National Electronic Injury Surveillance System (NEISS) of the Food and Drug Administration. The NEISS listings are an expansion and revision of the CPSI. NEISS product areas were slightly altered to conform to the scope of this tabulation.

The tabulation lists over 700 product areas and over 1000 standards' titles covering products found in and around the home. (The major consumer product areas not included are foods, beverages, and drugs.) The tabulation also indicates the applicable voluntary national, industrial, and international standards which deal primarily with either safety or performance or both aspects of the products listed. For some of the product areas, there are no applicable standards. Available information on certification programs and standards under development, and the Standard Industrial Classification (SIC) numbers for the products are also provided. Supersedes NBS Technical Note 705. TN763. A set of debugging and monitoring facilities to improve the diagnostic capabilities of a compiler, E. N. Fong, Nat. Bur. Stand. (U.S.), Tech. Note 763, 25 pages (Mar. 1973) 50 cents, SD Catalog No. C13.46:763.

Key words: Compiler; debugging; error diagnostic; highlevel programming languages; monitoring; proceduraloriented languages.

Increasing concern with the quality of computer software today makes it important to evaluate critically the debugging facilities available in high-level languages. This paper presents a collection of program debugging and monitoring facilities to improve the diagnostic capabilities of a compiler. A distinction is made between debugging and monitoring facilities performed at compile time, at link/load time and at execution time. These facilities are described in terms of this breakdown with a conscious attempt to move the detection of errors from execution time to compile or link/load time, and to collect information when the information is available during the compilation process. TN764. An investigation of the stability of and insulation leakage in some high temperature resistance thermometers: An interim report, S. D. Wood, Nat. Bur. Stand. (U.S.), Tech. Note 764, 31 pages (May 1973) 50 cents, SD Catalog No. C13.46:764.

Key words: Freezing point of zinc; high temperature resistance thermometer; insulation resistance; platinum resistance thermometer; resistance thermometer; stability; tungsten thermometer; zinc.

Data are presented concerning the stability of high temperature resistance thermometers. Two types of platinum and one type of tungsten thermometer were tested at 1065 °C and 960 °C. Some of the platinum thermometers were also tested at 900 °C and at the freezing point of zinc. Results of tests are also given on the insulation resistance of sensor supports and lead assemblies for the two types of platinum thermometers. A new design for a zinc-point cell is discussed briefly. Suggestions for future work are indicated.

TN765. Low temperature thermometry: Interim report, G. Cataland and H. H. Plumb, Nat. Bur. Stand. (U.S.), Tech. Note 765, 23 pages (May 1973) 40 cents, SD Catalog No. C13.46:765.

Key words: Acoustical thermometer; calibrator; germanium thermometers; heat conduction; NBS P2-20 (1965) scale; "speed of sound" isotherms; viscosity.

Earlier acoustical thermometer "speed of sound" isotherms are compared with recent measurements. Where systematic

deviations had appeared in "smoothing" through acoustically derived temperatures via germanium thermometers, a possible solution has emerged; more precise temperature control of the acoustical thermometer is desirable and has been realized. A cursory examination of the applicability of the Helmholtz-Kirchhoff equation was made with a modified sonic chamber. Measurements with the modified instrument have shown no changes in the experimental results.

The maintenance of the NBS P2-20 (1965) scale is described. A new calibration apparatus was constructed to accommodate more germanium thermometers thus reducing the calibration cost per thermometer during a calibration run.

TN766. A gamma ray moments computer code, GAMMOM-I, C. M. Eisenhauer, G. L. Simmons, and L. V. Spencer, Nat. Bur. Stand. (U.S.), Tech. Note 766, 41 pages (Apr. 1973) 75 cents, SD Catalog No. C13.46:766.

Key words: Computer code; gamma rays; gamma ray transport; gauss quadrature; moments; shielding.

In this paper we describe a computer code for generating spatial-angular moments of gamma ray energy fluence in an infinite medium. The equation for moments of the energy fluence is given and the techniques used for the solution are discussed. The structure of the code and of the main subroutines is also given. Details of the input and output data are presented and the printout from a sample problem is included.

TN767. Microelectronic interconnection bonding with ribbon wire, H. K. Kessler and A. H. Sher, Nat. Bur. Stand. (U.S.), Tech. Note 767, 31 pages (Apr. 1973) 50 cents, SD Catalog No. C13.46;767.

Key words: Aluminum wire; bonding; fabrication (wire bonds); microelectronics; ribbon wire; round wire; testing (wire bond); ultrasonic bonding; wire bond.

The feasibility of using aluminum ribbon wire for ultrasonic bonding of semiconductor microelectronic interconnections was studied, and several advantages over the use of round wire of equivalent cross-sectional area were found. Ribbon wire bonds exhibited little deformation or heel damage, and a greater percentage of bonds of a certain quality (as judged by pull strength and appearance) could be made over much greater ranges of the bonding machine parameters, time and tool tip displacement, using ribbon wire than was possible with round wire. The ease of positioning ribbon wire was indicated by making multiple ribbon wire bonds side-by-side on a 5-mil square pad, or by stacking up to four bonds one on top of another. However, bonding with harder than normal wire, previously thought to offer certain advantages with respect to higher bond tensile strength, yielded inconsistent results.

TN768. Nonmetallic coatings for concrete reinforcing bars. Coating materials, J. R. Clifton, H. F. Beeghly, and R. G. Mathey, Nat. Bur. Stand. (U.S.), Tech. Note 768, 40 pages (Apr. 1973) 65 cents, SD Catalog No. C13.46:768.

Key words: Chlorides; concrete; corrosion; epoxy coatings; organic coating; steel reinforcing bars.

This work was undertaken in order to determine the feasibility of using organic coatings, especially epoxies, to protect steel reinforcing bars embedded in concrete from accelerated corrosion attributed to the depassivation of steel by chloride ions.

Coatings have been evaluated on the basis of their chemical and physical durabilities as well as their protective qualities. In this study, attention has also been directed to the following: application methods; surface preparation of the steel reinforcing bar; and site of application.

TN769. A rigorous correction procedure for quantitative electron probe microanalysis (COR 2), J. Hénoc, K. F. J. Heinrich, and R. L. Myklebust, Nat. Bur. Stand. (U.S.), Tech. Note 769, 132 pages (Aug. 1973) $2.10, SD Catalog No. C13.46:769.

Key words: Continuum fluorescence; data reduction; electron probe microanalysis; fluorescence correction; quantitative analysis.

This publication describes a rigorous data reduction procedure for quantitative electron probe microanalysis, which avoids simplifications present in conventional schemes. In addition, the program contains a correction for fluorescence due to the continuum, and separate computation of the fluorescent effects of each exciting primary x-ray line. Constants characteristic of elements are stored in a permanent data file, and the constants and parameters needed for the calculation of mass absorption coefficients are contained in a sub-program. These provisions and decision-making sections in the development of the fluorescence corrections reduce the required input considerably.

TN770. Hazard elimination procedures for leaded paints in housing, D. Waksman, L. F. Skoda, and E. J. Clark, Nat. Bur. Stand. (U.S.), Tech Note 770, 99 pages (May 1973) $1.25, SD Catalog No. C13.46:770.

Key words: Building material; housing; leaded paint; lead hazard elimination methods; lead paint poisoning; performance attributes.

Methods currently used to control the hazard caused by leaded paints in housing vary in effectiveness from complete elimination of the hazard to a minimal effort that runs a high risk for recurrence of the hazard. A series of guidelines has been drawn up to acquaint municipal planners and other decision makers with the factors that should be considered in implementing a hazard elimination program. Formats are presented to describe attributes of the various methods that should be considered.

TN771. Some experiments on the stirring of viscous liquids, A. Napolitano, Nat. Bur. Stand. (U:S.), Tech. Note 771, 60 pages (May 1973) 85 cents, SD Catalog No. C13.46:771.

Key words: Agitators; borosilicate glass; glass melt; glass tank; liquids; stirrer; viscosity.

The stirring actions of several designs of small stirrers were observed and photographed in transparent viscous model liquids. The fluidity of the liquids was comparable to that of a molten borosilicate glass at fining temperatures. The most efficient features of one or more of these stirrers were incorporated into larger model stirrers and observed under actual stirring conditions. As a result of these performance tests, a final design of stirrer was selected and fabricated of platinum-rhodium metal and used in an experimental glass tank. The design of one of the pots in the experimental glass tank was modified to obtain the maximum stirring action with the selected stirrer.

TN772. A performance comparison of labeling algorithms for calculating shortest path trees, J. Gilsinn and C. Witzgall, Nat. Bur. Stand. (U.S.), Tech. Note 772, 92 pages (May 1973) $1.25, SD Catalog No. C13.46:772.

Key words: Algorithms; networks; paths; shortest-paths;

trees.

Many applications in transportation and communication require the calculation of shortest routes between points in a network, and several algorithms for the solution of this problem exist in the literature. This paper examines one class of such algorithms, that which calculates a shortest route from one point

in the network to all other intersection points. Computer data handling techniques which can be used to improve the two basic algorithms in this class are investigated. Results of computer timing runs on various types and sizes of networks are compared, and the differences, sometimes of an order of magnitude, are analyzed. Detailed flowcharts and computer programs of the tested algorithms are also included.

TN773. Methods of measurement for semiconductor materials, process control, and devices. Quarterly report, October 1 to December 31, 1972, W. M. Bullis, Editor, Nat. Bur. Stand. (U.S.), Tech. Note 773, 56 pages (June 1973) 80 cents, SD Catalog No. C13.46:773.

Key words: Base transit time; carrier lifetime; delay time; die attachment; electrical properties; electronics; epitaxial silicon; four-probe method; generation centers; germanium; gold-doped silicon; infrared response; methods of measurement; microelectronics; microwave diodes; probing techniques (a-c); pull test; recombination centers; resistivity; resistivity standards; semiconductor devices; semiconductor materials; semiconductor process control; silicon; Sparameters; switching transients; thermal resistance; thermally stimulated measurements; trapping centers; wire bonds.

This quarterly progress report, eighteenth of a series. describes NBS activities directed toward the development of methods of measurement for semiconductor materials, process control, and devices. Significant accomplishments during this reporting period include (1) completion of the investigation of the effects of current, probe force, and surface condition on the measurement of resistivity of bulk silicon wafers by the four-probe method, (2) establishment of operating conditions appropriate for determining the sensitivity of transient thermal response measurements to voids in transistor die attachment, and (3) initiation of an interlaboratory comparison of transistor scattering parameter measurements. Because of the general applicability of the first of these, details are presented in a separate appendix. Work is continuing on measurement of resistivity of semiconductor crystals; characterization of generation-recombinationtrapping centers in silicon; study of gold-doped silicon; development of the infrared response technique; evaluation of wire bonds and die attachment; measurement of thermal properties of semiconductor devices; determination of S-parameters, delay time, and related carrier transport properties in junction devices: development of a-c probing techniques; and characterization of noise and conversion loss of microwave detector diodes. Supplementary data concerning staff, standards committee activities, technical services, and publications are included as appendices. TN774. Fire service location-allocation models, D. Colner and D. Gilsinn, Nat. Bur. Stand. (U.S.), Tech. Note 774, 46 pages (June 1973) 75 cents. SD Catalog No. C13.46:774.

Key words: Algorithms; fire station location; heuristics; location-allocation models; location analysis; resource allocation analysis; transportation network analysis.

This paper compiles the various types of location-allocation models which analyze the impact of varying the number and location of fire stations. The assumptions of each model, the relationships between models, and possible heuristics and algorithms are discussed. In addition, a methodology of spatial concepts analogous to those used in transportation planning is presented.

TN775. Coordinated evaluation system (CES) project, model documentation for building regulation, R. D. Dikkers, Nat. Bur. Stand. (U.S.), Tech. Note 775 (16 pages) 35 cents, SD

Catalog No. C13.46:775.

Key words: Building regulation; evaluation; inspection; manufactured building; mobile homes; model documents; state-of-art study.

Background information, objectives and the current status (February 1973) of various tasks and reports pertaining to the Coordinated Evaluation System (CES) project are described. The goal of the CES Project is to develop model informational documentation that will assist state building regulatory agencies in establishing a coordinated and uniform evaluation, approval and inspection system. The model documentation will be related to the following building regulatory functions: (1) data submittal, (2) evaluation, (3) approval, (4) compliance assurance (inspection), (5) installation, and (6) owner information.

TN776. A new method for generating waterdrops of specified mass, J. E. Potzick, Nat. Bur. Stand. (U.S.), Tech. Note 776, 12 pages (May 1973) 35 cents, SD Catalog No. C13.46:776. Key words: Drop generator; liquid drop; waterdrop.

A waterdrop generator has been constructed, based on the mechanical resonance of a vibrating waterdrop, which can generate drops of 1.5 to 37 mg with standard deviations in the range of 0.1 percent to 10 percent of drop mass. Drop mass over this range and drop interval are remotely controlled.

TN777. Cost analysis of blood banking alternatives, T. Miller, M. King, J. Flannagan, E. Nilsson, and B. Lemieux, Nat. Bur. Stand. (U.S.), Tech. Note 777, 121 pages (Sept. 1973) $1.35, SD Catalog No. C.13.46:777.

Key words: Blood banks; blood utilization statistics; cost benefit analysis; donor profiles; peer review; regulatory activities; sensitivity analysis.

This report provides a description of the current blood banking system and of the collection and derivation of quantitative information concerning system operation and blood cost. A reasonably accurate but somewhat incomplete profile of practices, attitudes, and likely costs of present and alternative systems has been developed. Among the topics presented are: 1) a discussion of the blood collection process including statistics on present use and future needs; 2) information relating to donor motivation, attitudes and incentives; 3) a brief summary of demonstration programs in the U.S. and national blood programs in other countries which provides some insight concerning means for improving blood quality and availability; 4) a description of blood processing, storage and distribution procedures; 5) narrative and statistical information relating to blood utilization practices; 6) discussions of post transfusion reactions and frozen blood programs; 7) a discussion of current governmental and professional standards, regulations and controls which influence many, but not all, concerns involved in blood collection and processing.

This information serves as the basis for the selection of alternatives analyzed in a cost effectiveness analysis of eight apparently viable alternatives to the current system. Because of the possible variation which might be ascribed to many of the parameters used as a basis for costing alternatives, the sensitivity analysis is crucial in the comparison of alternatives.

TN778. Guidelines for selection of and use of foam polyurethane roofing systems, W. C. Cullen and W. J. Rossiter, Jr., Nat. Bur. Stand. (U.S.), Tech. Note 778, 46 pages (May 1973) 75 cents, SD Catalog No. C13.46:778.

Key words: Durability; fire safety; performance guidelines; protective coatings; rigid polyurethane; roofing.

The use of spray-in-place polyurethane foam for roofing application in the United States is increasing at a rapid rate. Little unbiased information is available to guide the user in the specification, selection, application, and performance of this innovative roofing system. This report describes the current state-of-the-art of rigid polyurethane technology as applied to roofing systems. The performance parameters as observed during the field survey are discussed in terms of protective coatings, fire safety, durability and problem areas. Guidelines to assist the supplier and user alike in the use and selection of polyurethane foam roofing systems are given. Finally, a performance specification for spray-in-place polyurethane foam roofing system is suggested. TN779. Data communications system throughput performance using high speed terminals on the dial telephone network, D. S. Grubb, Nat. Bur. Stand. (U.S.), Tech. Note 779, 40 pages (May 1973) 65 cents, SD Catalog No. C13.46:779.

Key words: Data communications; modems; terminals; throughput; TRIB.

Throughput performance of high speed data terminals using the dial telephone network is calculated for signaling rate of 1200 to 4800 bits per second using the ANSI X3.28-1971 control procedures and measured in terms of the proposed ANSI strand TRIB described in X3S35/80. The performance calculations are shown graphically with TRIB as a function of block length, error rates of the telephone connection, signaling rate and telephone line delays. Error rates are based on a published survey involving several hundred telephone connections to geographically distributed parts of the United States.

TN780. Controlled accessibility bibliography, S. K. Reed and M. M. Gray, Nat. Bur. Stand. (U.S.), Tech. Note 780, 15 pages (June 1973) 35 cents, SD Catalog No. C13.46:780.

Key words: Confidentiality; controlled accessibility; data integrity; data security; security.

A bibliography of 96 references on controlled accessibility has been compiled. The purpose in compiling this limited bibliography was to free the effort to solve the problems of controlled accessibility from domination by discussion of the issues of privacy. Insofar as possible, except when the two subjects are referred to in the same work or for overriding historical considerations, references dealing with privacy have not been included.

TN781. A study of six university-based information systems, B. Marron, E. Fong, D. W. Fife, and K. Rankin, Nat. Bur. Stand. (U.S.), Tech. Note 781, 98 pages (June 1973) $1.25, SD Catalog No. C13.46:781.

Key words: Computer-based

systems; information

systems, university; university computer systems.

A methodology for categorically describing computer-based information systems was developed and applied to six university-based, NSF-supported, systems. The Systems under study all operate as retail information centers primarily serving campus communities by accessing large commercially-available data bases using 3d generation computer configurations. The systems vary in design philosophy, mode of user service, transferability characteristics, and operational status. A summary matrix is included.

TN782. Application of systems analysis to the operation of a fire department, E. K. Nilsson, J. A. Swartz, and M. Westfall, Nat. Bur. Stand. (U.S.), Tech. Note 782, 52 pages (June 1974) SD Catalog No. C13.46:782.

Key words: Alexandria; fire department; location; operations research; resource allocation; simulation; systems analysis.