grams tested, all in present-day use, included representatives from several statistical packages as well as some from the SHARE library. Essentially four different algorithms were used in the various programs to obtain the coefficients of the least squares fits. The tests were run on several different computers, in double precision as well as single precision. By comparing the coefficients reported, it was found that those programs using orthogonal Householder transformations or Gram-Schmidt orthonormalization were much more accurate than those using elimination algorithms. Programs using orthogonal polynomials (suitable only for polynomial fits) also proved to be superior to those using elimination algorithms. The most successful programs accumulated inner products in double precision and made use of iterative refinement procedures. In a number of programs, the coefficients reported in one test problem were sometimes completely erroneous, containing not even one correct significant digit. Weber, L. A., Density and compressibility of oxygen in the critical region, Phys. Rev. A. 2, No. 6, 2379–2388 (Dec. 1970). Key words: Chemical potential; coexistence curve; compressibility; critical point; oxygen; PVT. Density versus height profiles have been measured in the critical region of oxygen by means of capacitance techniques. Results are given for the liquid and vapor densities at coexistence, for compressibilities along the coexistence curve to within t = (T — Tc)/Tc =-6 × 10-3, for compressibilities along the critical isotherm to within (p-pc/pc=5× 10-2, and for compressibilities along the critical isochore to within t=2× 10-4. The data are analyzed in terms of power law descriptions and are shown to be in excellent agreement with recent scaling law analyses of data for other fluids. Weber, L. A., Some vapor pressure and P, V, T, data on nitrogen in the range 65 to 140 K, J. Chem. Thermodynamics 2, No. 6, 839–846 (Nov. 1970). Key words: Density; liquids; nitrogen; phase boundary; PVT; saturation density; vapor pressure. New data are presented for the vapor pressure of nitrogen from 65-126 K and for seven PVT isochores between 80 and 140 K. The isochores range in density from 0.85 to 2.6 times critical. The vapor pressure data are compared with existing literature, and an equation is given for the vapor pressure on the IPTS-68 temperature scale between the triple point and the critical point. Weiderhorn, S. M., Johnson, H., Effect of pressure on the fracture of glass, J. Appl. Phys. 42, No. 2, 681-684 (Feb. 1971). Key words: Deep submergence; fracture; fracture energy; glass; high pressure; strength. The fracture surface energies of three glass compositions were measured as a function of ambient pressure and were found to be independent of pressure, to 20 kbar, suggesting no change in the fracture mechanism. The mechanical behavior of glass thus differs from that of plastics or metals which are observed to become stronger and more ductile with increasing pressure. The difference in fracture behavior is believed due to the fact that fracture of glass is essentially a volume conserving process in contrast to metals and plastics for which volume expansion occurs. Yokel, F. Y., Mathey, R. G., Dikkers, R. D., Strength of masonry walls under compressive and transverse loads, Nat. Bur. Stand. (U.S.), Bldg. Sci. Ser. 34, 74 pages (Mar. 1971) 70 cents, SD Catalog No. C.13.29/2:34. Key words: Brick; cavity walls; composite walls; compressive strength; concrete block; flexural strength; masonry; mortar; slenderness effects; standards; structural stability; walls. Ninety walls of 10 different types of masonry construction were tested under various combinations of vertical and transverse load. It is shown that the effect of vertical load and wall slenderness on transverse strength can be predicted by rational analysis. The analysis is based on established theory which has been extended to account for the properties of masonry. Similar methods of rational analysis have been adopted for the design of steel structures and are presently being considered for reinforced concrete structures. Other NBS Publications J. Res. Nat. Bur. Stand. (U.S.), 75 C Engineering & Instrumentation, No. 2 (April-June 1971), SD Catalog No. C13.22/ sec. C:75/2. $1.25. Heated air adiabatic saturation psychrometer. L. Greenspan. An improved method for microwave power calibration, with appli- A program in refractory metal thermocouple research. G. W. Burns and W. S. Hurst. Polarization measurements as related to the corrosion of underground steel piling. W. J. Schwerdtfeger. Publications of the National Bureau of Standards. Armstrong, G. T., Gibbs energy versus free energy, Chem. Eng. News, Letter to the Editor, p. 3 (April 26, 1971). Baker, M. A., Study of the adherence of porcelain enamel to aluminum-use of the electron microscope and electron microprobe, Proc. Porcelain Enamel Institute Technical Forum, University of Illinois, Urbana, Ill., Oct. 7-9, 1970, 32, 48-51 (Porcelain Enamel Institute, Washington, D.C., 1971). Ballard, D. B., Yakowitz, H., Goldstein, J. I., Study of metal in the lunar soil, Proc. 4th Annual Scanning Electron Microscope Symp., ITT Research Institute, Chicago, Ill., April 29, 1971. Part 1, 169-176 (April 29, 1971). Brower, W. S., Jr., Parker, H. S., Growth of single crystal cuprous oxide, J. Crystal Growth 8, 227–229 (1971). Bullis, W. M., Editor, Methods of measurement for semiconductor materials, process control, and devices, Quarterly Report July 1 to September 30, 1970, Nat. Bur. Stand. (U.S.), Tech, Note 571, 58 pages (Apr. 1971) 60 cents, SD Catalog No. C13.46:571. Burdick, M. D., An instrumental procedure for evaluating adherence of porcelain enamel cover coats direct-to-steel, Proc. Porcelain Enamel Institute Technical Forum, University of Illinois, Urbana, Ill., Oct. 7-9, 1970, 32, 160-167 (Porcelain Enamel Institute, Washington, D.C., 1971). Carter, R. S., Editor, Reactor Radiation Division: Annual Progress Report for the Period Ending October 31, 1970, Nat. Bur. Stand. (U.S.), Tech. Note 567, 66 pages (Mar. 1971) 70 cents, SD Catalog No. C13.46:567. Costrell, L., CAMAC instrumentation system-introduction and general description, (Proc. Nuclear Science Symp., New York, N.Y., Nov. 6, 1970), IEEE Trans. Nucl. Sci. NS-18, No. 2, 1-6 (April 1971). Currie, L. A., Rodriguez-Pasqués, R. H., Photonuclear tritium yields at 90 MeV, Nucl. Phys. A157, 49-60 (1970). Danos, M., Gillet, V., Evidence for quartet structure in medium and heavy nuclei, Physics Letters 34B, No. 1, 24-26 (Jan. 18, 1971). Dikkers, R. D., Marshall, R. D., Thom, H. C. S., Hurricane CamilleAugust 1969, Nat. Bur. Stand. (U.S.), Tech. Note 569, 71 pages (Mar. 1971) 70 cents, SD Catalog No. C.13.46:569. DiMarzio, E. A., Guttman, C. M., Separation by flow and its application to gel permeation chromatography, J. Chromatog. 55, 83-97 (1971). Dziuba, R. F., Dunfee, B. L., Resistive voltage-ratio standard and measuring circuit, IEEE Trans. Instr. Meas. IM-19, No. 4, 266-277 (Nov. 1970). Engen, G. F., A new method of characterizing amplifier noise performance, IEEE Trans. Instr. Meas. IM-19, No. 4, 344–349 (Nov. 1970). Fickett, F. R., Clark, A. F., Longitudinal magnetoresistance anomalies, J. Appl. Phys. 42, No. 1, 217–219 (Jan. 1971). Franklin, A. D., Bennett, H. S., Editors, ARPA-NBS program of research on high temperature materials and laser materials, Reporting Period July 1 to December 31, 1970, Nat. Bur. Stand. (U.S.), Tech. Note 574, 44 pages (May 1971) 50 cents, SD Catalog No. C13.46:574. Gadzuk, J. W., Plummer, E. W., Energy distribution for thermal field emission, Phys. Rev. B. 3, No. 7, 2125-2129 (April 1, 1971). Gadzuk, J. W., Plummer, E. W., Hot-hole-electron cascades in field emission from metals, Phys. Rev. Letters 26, No. 2, 92-95 (Jan. 11, 1971). Herron, J. T., Huie, R. E., Mass spectrometric studies of the reactions of singlet oxygen in the gas phase, Ann. N.Y. Acad. Sci. 171, Article 1, 229–238 (Oct. 15, 1970). Hustvedt, E. H., Conference Coordinator, Friend, M. L., Editor, Proceedings of joint meeting of government operations research users and producers, held at the National Bureau of Standards, Gaithersburg, Maryland, June 5-6, 1969, Nat. Bur. Stand. (U.S.), Spec. Publ. 347, 164 pages (May 1971) $1.25, SD Catalog No. C13.10:347. Klein, M., Hanley, H. J. M., The m-6-8 potential function, J. Chem. Phys. 53, No. 12, 4722-4723 (Dec. 15, 1970). Laufer, A. H., Low-temperature chromatographic determination of ketene and methyl ketene, J. Chromatogr. Sci. 8, 677-678 (Nov. 1970). McDonald, D. G., Evenson, K. M., Wells, J. S., Cupp, J. D., Highfrequency limit of the Josephson effect, J. Appl. Phys. 42, No. 1, 179-181 (Jan. 1971). Matarrese, L. M., Evenson, K. M., Improved coupling to infrared whisker diodes by use of antenna theory, Appl. Phys. Letters 17, No. 1, 8-10 (July 1, 1970). Moore, C. E., Annual report on spectroscopy, July 1, 1969-June 30, 1970, Bull. Am. Astron. Soc. 3, No. 1, 154–155 (1971). Mountain, R. D., Comment on Rotational diffusion of sphericaltop molecules in liquids, J. Chem. Phys. 54, No. 7, 3243 (April 1, 1971). Nimeroff, I., Color-match classification by variable parameters, Color. Engr. 9, No. 2, 13-17 (March-April 1971). Olson, W. B., Papousek, D., High-resolution infrared spectra of ethanelike molecules and the barrier to internal rotation: The V, V13 band of dimethylacetylene, J. Mol. Spectry. 37, No. 3, 527-534 (March 1971). Pecker, J. C., Thomas, R. N., Personal libraries and publication policies, Atoms 25, 37-38 (Jan. 1970). Phucas, C. B., Technical Standards Coordinator, Package quantities of instant nonfat dry milk, Nat. Bur. Stand. (U.S.), Prod. Stand. 37-70, 9 pages (April 1971) 10 cents, SD Catalog No. C13.20/2:37-70. Ramboz, J. D., A link-compensated ratio transformer bridge, Rev. Sci. Instr. 42, No. 4, 522–524 (April 1971). Ruegg, F. C., A circuit which expands the count storage capacity of a multichannel analyzer, Nucl. Instr. Methods 92, 7-11, (1971). Scott, W. W., Jr., New coaxial RF-DC ammeter, IEEE Trans. Tate, E. L., Improving library collections by weeding, Proc. U.S. Van Blerkom, D., Hummer, D. G., The normalized on-the-spot approximation for line transfer problems, J. Quant. Spectrosc. Radiat. Transfer Note 9, No. 11, 1567-1571 (Nov. 1969). Wachtman, J. B., Jr., Standard materials for measurements on ceramics, Am. Ceram. Soc. Bull. 50, No. 3, 242-247 (March 1971). Wait, D. F., The precision measurement of noise temperature of mismatched noise generators, IEEE Trans. Microwave Theory Tech. MTT-18, No. 10, 715-724 (Oct. 1970). Wallace, B., Brown, W. E., Stoichiometric composition of whitlockite, J. Dental Res. 50, No. 2, 343-346 (March-April 1971). Woelfel, J. B., Paffenbarger, G. C., Expanding and shrinking 7year-old dentures: report of cases, J. Am. Dental Assoc. 81, No. 6, 1342-1348 (December 1970). Zimmerman, J. E., Recent Developments in superconducting devices, J. Appl Phys. 42, No. 1, 30-71 (Jan. 1971). *Publications for which a price is indicated are available by purchase from the Superintendent of Documents, U.S. Government Printing Office, Washington, D.C. 20402 (foreign postage, onefourth additional). The NBS non-periodical series are also available from the National Technical Information Service (NTIS), Springfield, Va. 22151, which was formerly the Clearinghouse. Reprints from outside journals and the NBS Journal of Research may often be obtained directly from the authors. U.S. GOVERNMENT PRINTING OFFICE: 1971 OL 429-270 |