The isotopic method of determining absolute age is the most accurate and .... Another method of relative age dating involves the relative abundance of ...

We report on progress made mapping Aristarchus Crater using high-resolution LROC NAC images. Observations include enigmatic impact melt features and stratified blocks of ejecta. An absolute model age using crater counts was also determined.

... earth's crust and upper mantle; (Stratigraphy, methods of the determination of absolute age of rocks and geochronology, paleomagnetic researches ...

This activity uses the CHRONOS website to determine the absolute age of a portion of the geological time scale through the construction and use of a calibration curve

Application of the lead -uranium method is proposed for the absolute age determinations on sedimentary rocks with the aid of authigenic uranium concentrations. Uraniumbearing sulfides and apatites, as well as the micaceous part of sandstones and conglomerates proved to be the most suitable material for such ...

Results of absolute age determination of late-quaternary deposits are given. The chief material was selected from the Central region of the European territory of the USSR, it is connected with the history of the last glaciation on the surface of the Russian plain. Dating by layers of the peat deposit key sections was ...

... M. A. and H. Schleicher. 1990. Absolute age determinations: physical and chemical dating methods and their application. New York: Springer. ... ...

Radiocarbon allows the absolute dating of carbon samples. The apparatus necessary and the successive operations in dating a sample are described. Some results obtained by this method are given. (tr-auth)

... the nature of the deposits within Crystal Cave, Uranium-series dating of flowstones appears to be the ... of determining absolute ages. It is known that Uranium isotopes decay ...

Age determinations on nine samples from the southeastern part of the Beartooth Range, Montana, indicate that the absolute age of the pegmatites and granitic gneisses of this area is 2750 plus or minus 150 m.y. A single determination from the northern Bighorn Mountains, Wyoming, ...

The relation of age to division of labor was assessed in a primitively eusocial wasp, Ropalidia marginata. The performance of four functionally signicant tasks was analyzed. It was found that age has a denite correlation with division of labor, since wasps performed tasks in a distinct sequence in their life with successive tasks being initiated at ...

The results of a radiochemical investigation of ferromanganic nodules from the Pacific and Indian Oceans are outlined. The migration of Ra from internal layers was established. A strongly surplus Ra and Th/sup 230/ content in the external and greatest part of internal layers was ascertained. The necessity of a differentiation of two concepts is noted: the absolute ...

The development of radiogeophysics is briefly discussed, and its fundamentals are indicated. The different cases of utilization of radioactive constants for absolute age determinations are discussed. The conditions for the applications of these methods are described. A special discussion is presented of the lead isotopic ...

The possibility of employing the calcium method for age determinations was investigated. Samples of white sylvite were used for the investigation. The calcium was separated by an ion exchange technique, and the Ca/sup 44/Ca/sup 42/ ratio was determined. The results are tabulated. For comparison the age ...

... Title : DETERMINATION AND APPLICATION OF ABSOLUTE TRANSITION PROBABILITIES AND LIFETIMES OF ATOMS, MOLECULES, AND IONS ...

This unit introduces younger students to the concept of relative versus absolute time and how geologists determine the age of geologic events and features. Topics include the laws that determine relative age (superposition, cross-cutting relationships, included fragments, and others), and how ...

Accurate absolute properties are determined for the first time for the 3.15 day period eccentric eclipsing binary star FT Ori based on new absolute photometry, five differential light curves, and a radial velocity curve. The stars appear to be normal for their spectral types, A0 + A2. The orbit is highly eccentric (e = 0.409) and shows ...

techniques to Earth materials and events Relative Age Dating Determining the "relative" age of a rock unit #10: Geologic History Objective: Understand and apply relative age dating and absolute age dating to something else. Relative Age Dating ...

It is argued that there should be an agreement as to what conventions to use in determining absolute

The method used in the preparation of a ThB standard for use in absolute age determinations of thorium minerals is described in detail. The standard was prepared from a thorite of Kivu (Belgian Congo). (J.S.R.)

... M. A. and H. Schleicher. 1990. Absolute age determination: physical and chemical dating methods and their application. New York: Springer- ... ...

... ADA286670. Title : Absolute Determination of the Acceleration of Gravity at the All-Union Scientific Research Institute of Metrology,. ...

... Title : Absolute Determination of Elastic Constants and Stresses from Ultrasonic Group Velocity Data,. Corporate Author : ...

A brief summary of the geological characteristics of rare-metal pegmatites of the Eastern Sayan is given. According to muscovite their age was determined by the potassium-argon method to be 1700 to 1800 miilion years; according to microcline, 1300 million years. On connection with the incomplete preservation state of radiogenous argon in the ...

This interactive tutorial provides students with an overview of Earth's history and its relation to geologic time. Topics include the age of the Earth, the use of timelines, and the concepts of relative and actual age. Once these topics have been covered, their applications to rocks and fossils are explained through the concepts of superposition (oldest ...

... Title : Stratigraphy and Absolute Age of Deep-Sea Sediments in the Western Pacific Ocean (Stratigrafiya I Absolyutnyy Vozrast Glubokovodnykh ...

The age relations of granite intrusions of the Ukraine were investigated by using the argon method. New data are reported on the age of magmatic rocks of the Northern Caucasus. The effects of the emanation of radioactive elements from minerals on the determination of the absolute geological age ...

This test operations procedure (TOP) delineates general test and specific subtest procedure required to determine the technical performance of absolute altimeters. Absolute altimeters which are used to measure vertical separation between the aircraft and ...

The 6th congress of the Commission of the Geological-Ge raphical Department of the Academy of Science was held at Sverdlovsk from May 22 to May 27, 1957. The three principal method of determining the age of uranium -thorium - lead, uranium -thorium- helium, and potassium-argon formations were successfully applied. In addition, the method of ...

The TM multispectral scanner system was calibrated in an absolute manner before launch. To determine

... Presented in the report are the results of determination of the absolute spectral sensitivity of photographic films developed by Gosniikhimfotoproyekt ...

In this exercise, students investigate methods used by geologists studying active tectonics for determining ages in actual numbers of years. Introductory materials describe the three most-used techniques for dating material formed during the Quaternary Period (approximately the last 1.65 million years), discuss the concepts of radioactive decay and ...

The uranium and lead concentnation and isotopic composition in a variety of samples of kolm and associated black shale from the Peltura beds (Franconian stage) of the Upper Cambrian of Sweden were determined by isotope dilution techniques. In addition Th/sup 230/ Ra/sup 226/ Pb/sup 21/ s/sup 0/, and radon leakage values were determined on certain ...

Based on photometric data of the central parts of eight globular clusters and one open cluster presented by An and his collaborators, we select red horizontal branch (RHB) stars in the (g-r)0-g0 diagram and make a statistical study of the distributions of their colors and absolute magnitudes in the SDSS ugriz system. Meanwhile, absolute magnitudes in the ...

The problem with relating them to terrestrial geologic ages is that we do not have absolute ages for the surface materials and so it is difficult to ...

The uranium and thorium contents of a thorite from Kivu were determined. The very low U/Th ratio found makes this mineral a good standard for gamma spectrometry and fer all other direct radiometric measurements of thorium. The mineral was used in the preparation of ThB standards for the determination of the absolute ...

... Accession Number : ADA205041. Title : Implications of Conservation Equations for the Determination of Absolute Velocities. ...

... BASED ON THE CHANGE IN ABSOLUTE INTENSITY OF ... A METHOD FOR DETERMINING THE TEMPERATURE STABILITY OF TRANSPARENT ...

The purpose of this study is to identify the age of peak performance in a broad range of athletic events incorporating multiple, diverse biological systems, learned skills, and motivation. Although many researchers have noted that the absolute levels of peak performance among superathletes have improved dramatically in the last 100 years, to date no one ...

Determination of the age of the dwellings of primitive man is of interest both from the point of view of the stratigraphy of quaternary deposits and for solving anthropogenetic problems. For this reason, radiocarbon dating techniques were used for layers containing paleolithic residue of Molodova V, located in a 200-m deep canyon at the right bank ...

We review two new methods to determine the age of globular clusters (GCs). These two methods are more accurate than the classical isochrone fitting technique. The first method is based on the morphology of the horizontal branch and is independent of the distance modulus of the globular cluster. The second method uses a careful binning of the stellar ...

... theorists from the 'golden age' of nuclear strategy. His farsighted theories stated in The Absolute Weapon: Atomic Power and World Order,' are as ...

In September 1991, a mummified corpse was found in a small rock depression at the Hauslabjoch, which is located in the �tztal Alps (part of Similaun Massiv), South-Tyrol, Italy. To determine the absolute age of the Ice Man, different samples were radiocarbon dated with AMS. In this work all available radiocarbon dates are compared ...

The ages of several uranium minerals were determined. Values obtained by measurement of the ratio Pb/sup 207//Pb/sup 206/ were compared with those derived from the ratios Pb/sup 20/s/ U/sup 238/ and Pb/sup 207//U/sup 235/ A study of the disagreem ents between these various ratios (by utilizing the Wetherill method) shows that the uranium minerals ...

Absolute Risk of Breast Cancer age 40 mother had breast cancer nulliparous no biopsies menarche age 14 What is the chance that she will be diagnosed with breast cancer between ages 40 and 70?

... 4. TITLE AND SUBTITLE P-Vector Method for Determining Absolute Velocity From Hydrographic Data 5a. CONTRACT NUMBER 5b. ...

... ADA480668. Title : P-Vector Method for Determining Absolute Velocity From Hydrographic Data. Descriptive Note : Journal article. ...

A method is described whereby the absolute radiative quantum efficiency of paramagnetic ions in liquids or solids can be determined from photoacoustic measurements. 1 figure.

Inter-hotspot motion within the Pacific plate is one of the most controversial issues in recent geophysical studies. However, it is a fact that many geophysical and geological data including ages and positions of seamount chains in the Pacific plate can largely be explained by a simple model of absolute motion derived from assumptions of rigid plates and ...

The aim of this cross-sectional study was to compare the accuracy of the Cameriere European formula (Cameriere), adopted Haavikko method from 1974 (Haavikko), and revisited Demirjian method by Willems (Willems) for age estimation on orthopantomograms (OPGs) of Bosnian-Herzegovian (BH) children age groups 6-13�years. The accuracy was ...

A new interpretation is offered for the argon losses in non- recrystallized sylvite. It is shown that all nonrecrystallized sylvites, indicating earlier age periods, were of various hues of red because of inclusions of hematite. An analysis was made of white, rose, and red sylaites of the Starobinskii deposit and the content of hematite responsible for the red hues ...

A method for the production of t-butoxy radicals by the photolysis of t-butyl hypochlorite was employed to determine the absolute rate of combination of t-butoxy radicals at room temperature and to determine the absolute rate of hydrogen atom abstraction ...

The status of absolute gravimetry is discussed. An easily portable apparatus for the absolute determination of the acceleration of gravity is described. Laboratory tests of this instrument indicate that a measurement accuracy of six parts in a billion is achieved. This corresponds to an equivalent height sensitivity of about 2 cm.

Terrestrial carbonate deposits with a banded layer structure can be good tools for the extraction of past environmental information on global and local scales using trace element concentrations and stable isotope ratios. The absolute age dating is most important for the reconstruction of an environmental chronicle. The measurements of fluorescent annual ...

A description is given of the methods of extracting isotopes, enriched in Pb/sup 206/ and Pb/sup 208/, from radioactive minerals. The isotopes were then used as standards for determining lead in minerals by the method of isotope dilution for establishing the absolute age of the minerals. (auth)

Analysis of crater size-frequency distributions (CSFD) of impact craters on planetary surfaces is a well-established method to derive absolute ages on the basis of remotelysensed image data. Although modelling approaches and the derivation of absolute ages from a given CSFD have been described in considerable depth ...

Mass spectrometric studies on lead galena from Hungarian deposits were reported. The results were discussed from the standpoint of absolute age determination. The measurement points show a linear, but non-isochronous distribution in the Houtermann diagram. The principles of a new model, based on a development of the lead ...

An overview is presented of the early history of observational cosmology and of later relevant developments in stellar evolution, the age-dating of the universe, and the eschatology of the system. Particular attention is given to the history of the experimental determination of the curvature of space. Consideration is given to the the non-Euclidean ...

The potassium-argon method was used to determine the absolute age of three granitoid intrusions in Central Pamir. The intrusions were 2 to 4 km wide, and 10 to 40 km long. The potassium content in the mineral was determined by dipycrylamine, and argon by a volumetric method with mass-spectrometric control ...

The subjects of this paper are a discussion of the methodology of relative age determination by impact crater statistics, a comparison of currently proposed Martian impact chronologies for the determination of absolute ages from crater frequencies, a report on our work of dating Martian ...

This report discusses procedures have been established for determining the absolute activities of Sr{sup 90}, Sb{sup 125}, Cs{sup 137}, and gross beta in First Cycle Supernatant. These procedures are also valid for other samples such as scavenged Radioactive Waste (RAW), the primary restriction being that the age of the material be at ...

... OF DETERMINING THE ABSOLUTE DIMENSIONS OF WELD FLAWS, NAMELY PROBE MOVEMENT AND TIME OF FLIGHT TECHNIQUES. ...

... Title : INFLUENCE OF CARBOXYMETHYL CELLULOSE PROPERTIES ON THE DETERMINATION OF CELLULASE ACTIVITY IN ABSOLUTE ...

... the photon yields in the ... Descriptors : *CHEMICAL REACTIONS, *PHOTONS, *CHEMILUMINESCENCE ... LASERS, FLUORINE, YIELD, NITROGEN ...