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Pressure-volume, uniaxial stress loading to failure, uniaxial strain, and acoustic velocity determinations were made on Blair dolomite at confining pressures ranging to 3.5 GPa (Pa = Paschals where 10/sup 5/ Pa = 1 bar or 0.1 GPa = 1 kbar). The bulk modulus K, rapidly rises from an initial 10.4 GPa (at atmospheric pressure) to 102.0 GPa at 1 GPa pressure. At higher pressures, K remains essentially constant (110 GPa). The maximum volume change on loading is 3.9% at 3.5 GPa; the unloading closely follows the loading path. Comparison of uninxial stress tests in compression to 0.7 GPa and extension to 2.1 GPa confining pressure demonstrates that the characteristic shear stress at failure as well as the transition from brittle fracture to ductile flow is strongly dependent upon both the value of the intermediate principal stress sigma /sub 2/ and the rate of strain. The onset of dilatancy as determined in uniaxial compression occurs at about two-thirds of the failure stress. The uniaxial strain loading path is well below the failure envelope in compression. In uniaxial stress loading (compression), Young' s modulus (E) and shear modulus ( mu ) are demonstrated to be very sensitive to both confining pressure and …

The mechanical properties of tuff from instrument hole UG3, tunnel U12e.06 at the Nevada Test Site have been investigated to 1400 MPa, The shear strength increases from about 5 MHa unconfined to 12 MPa at 300 MPa mean pressure. A brittle-ductile transition was indicated at about 250 MPa. In uniaxial strain, the sample loads to the vicinity of the failure envelope and then is parallel to that envelope up to the highest stresses, 420 MPa. Hydrostatic pressure of 1400 MPa produces about 9% volume compression and 1.3% permanent compaction in this apparently saturated tuff. (auth)

It was demonstrated that a transient surface-current pulse can be sensed and recorded by a graded-Hc film, a magnetic film with the coercive force Hc varying along the length of the film. Information on the magnitude of the current can be obtained by comparing the domain-wall location with the distribution of Hc value along the film. The transient characteristic of the current pulse can be deduced from the V-shaped configuration of the domain wall. (auth)

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A failure analysis was conducted on an aluminum (5083) structure subjected to fatigue testing. Failure occurred by fatigue in an electron-beam weld; the cycles to failure were reasonable for the loading conditions. (5 figures) (auth)

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Engineering information is provided to fabricate and operate equipment for generating hollow cathode arcs. Topics include equipment selection and design, operating procedures, and operating characteristics. Hollow-cathode operating characteristics for a wide range of cathode sizes, gas-flow rates, gas types, and cathode-anode spacings are covered. (auth)

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This report discusses court decisions concerning the right of the individual to refuse blood transfusions on religious grounds.

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This report discusses inmate employment programs in federal and state prisons and provides the results of a CRS survey of federal and state prisons regarding the types of inmate employment available, how many inmates were employed, and the wages for employment.

This report provides a listing of state "Good Samaritan" laws which protect doctors and emergency personnel from civil liability when voluntarily assisting those in need of emergency assistance.

This report provides basic information about three federal occupational health and safety laws: the Federal Metal and Nonmetallic Mine Safety, Act, the Federal Coal Mine Health and Safety Act of 1969, and the Occupational Safety and Health Act of 1970.

This report discusses the United States economic ties with the Republic of China in Taiwan and analyzes Taiwan's economic growth since 1950 and their policies toward trade with countries that recognize the government of the People's Republic of China. U.S. policy options in the future regarding trade ties with Taiwan are also discussed.

This report presents and analyzes data and statistics on U.S. direct foreign investment, as well as the taxation of American businesses abroad. In addition, it provides a detailed summary of tax policies in the top fifteen countries for U.S. direct foreign investment.