Добрый день, Коллеги. Важное сообщение, просьба принять участие. Музей Ферсмана ищет помощь для реставрационных работ в помещении. Подробности по ссылке
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
This part of ISO 13317 describes a method for the determination of the particle size distribution of a powder dispersed in a liquid using gravity sedimentation. The measurement of the concentration of solids settling in a liquid suspension is achieved by monitoring the incremental signal absorption from a beam of X-rays.
The method of determining the particle size distribution described in this part of ISO 13317 is applicable to powders which can be dispersed in liquids or powders which are present in slurry form. The typical particle size range for analysis is from about to about . The method is used for materials containing particles of the same chemical composition which produce adequate X-ray opacity. <...>
A number of Australian underground mines are using empirical rating systems to characterize the ground conditions in developmental headings for geotechnical design. The two best-known rating systems are Barton’s Rock Tunnelling Quality Index (Q-System, also known as the NGI System) and Bieniawski’s Rock Mass Rating (RMR, also known as the Geomechanics Classification). As the RMR makes no allowance for high ground stresses at depth, Barton’s Q-System is more likely to be used in deep Australian underground mines. The Q-value is determined from equation 1 using the six parameters listed in table 1. The numerical value of Q ranges from 0.001 (exceptionally poor) to 1000 (exceptionally good) quality rock. <...>
In recent years, an increasing number of studies have used single-grain age dating of detrital sediments to obtain information on sediment provenance, the thermal history and exhumation of sediment source areas, and landscape evolution. In order to highlight the value of this current development in geological research, we based this volume on papers presented in a session on detrital thermochonology at the 2002 Geological Society of America Annual Meeting held in Denver, Colorado. This Special Paper provides a short overview of the different, nowadays commonly used, dating techniques in detrital thermochronology, followed by discussion of some of the methodological aspects of detrital thermochronology (in the first two manuscripts) and of a variety of applications of detrital thermochronology, demonstrated in several regional case studies. <...>
The United States and the individual states have followed a legal system based on Roman law, which allows private ownership of oil and gas interests. Nevertheless, the federal and state governments control the leasing of about one-third of the oil and gas interests underlying the onshore landmass of the United States (estimated at 2.2 billion acres). They also control 100% (97% federal and 3% state) of the offshore areas of the United States (estimated at 885.6 million acres). In additional, 54 million acres of Indian lands are subject to U.S. government leasing control, and leasing rights to 44 million acres in Alaska are controlled by Alaskan natives (Mineral Management Service, 1989; Petroleum Independent, 1991). <...>
The physical and mechanical properties of clay materials required to scale the tectonic analogue experiments are analysed based on the modern soil mechanics concepts. A practical procedure for the determination of these properties is presented. Scaled clay experiments under Riedel shear mechanism produced a series of typical pull-apart structures. At the initial stages of the development of the deformation zone within the clay slab, the synthetic shear fractures (Riedel shears) display dilatational behaviour.
Activities in mineral deposit modeling have continued to develop on several fronts since the publication of “Mineral Deposit Models,” edited by Cox and Singer (1986). That bulletin is a collection of 87 descriptive deposit models and 60 grade and tonnage models prepared by many authors both from within and outside of the U.S. Geological Survey. The present bulletin continues that effort with the addition of new or revised models. Before these models are introduced, a review of modeling as used here is provided as well as an overview of mineral deposit modeling since the publication of Cox and Singer (1986).
JACKSON, P. D., GUNN, D. G., FLINT, R. C., BEAMISH, D., MELDRUM, P. I., LOVELL, M. A., HARVEY, P. K. & PEYTON, A. A non-contacting resitivity imaging method for characterizing whole round core while in its liner
PROSSER, D. J., HURST, A. & WILSON, M. R. One-man operable probe permeameters
McDOUGALL, S., DIXIT, A. & SORBIE, K. S. Network analogues of wettability at the pore scale
PUGLIESE, S. & PETFORD, N. Pore-structure visualization in microdioritic enclaves
BASAN, P. B., WHATTLER, P. R., LOWDEN, B. D. & ATTARD, J. J. Pore-size data in petrophysics: a perspective on the measurement of pore geometry
This Introduction - and its philosophies - are dedicated to the late Johann (Hans) Steiner (Canada) and John Elliston (Australia) for their respective concepts offered far ahead of most of their contemporary fellow scientists. That is, Steiner’s ideas in “The sequence of geological events and the dynamics of the Milky Way Galaxy - the present cosmic year; a preliminary study” (J. Geol. SOC. Aust., 1967, 14(1): 99 - 132)
Ephemeral streams, dry washes, gullies, draws and arroyos are common names for a major element of Western landscapes. By definition ephemeral streams are characterized by short periods of flow, following local and intense rainfall, and alternating with long periods in which the channel is dry (Fig.] ,2).