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  • Elsevier  (121,254)
  • Wiley  (41,754)
  • 1965-1969  (104,498)
  • 1960-1964  (58,510)
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Publisher
Years
Year
  • 1
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    The coagulation of hydrosols by brownian motion and laminar shear flow (1964)
    Elsevier
    Details
    Publication Date: 2023-01-16
    Description: The coagulation of hydrosols was investigated theoretically and experimentally. A reduced form of the particle size distribution function, designated “self-preserving,” was found to satisfy Smoluchowski's equations of coagulation by Brownian motion and shear flow. Brownian motion coagulation experiments with two heterogeneous hydrosols showed that the distributions were self-preserving. The rate of coagulation for heterogeneous systems was found to be second order in total particle concentration, consistent with the self-preserving form of the distribution function. Coagulation experiments were carried out in a simple laminar shear field using a homogeneous Dow polystyrene latex dispersion. Smoluchowski's shear flow theory was confirmed for shear rates ranging from 1 to 80 sec.−1 The shear coagulation of a heterogeneous emulsion was studied at several shear rates, and the size distributions were self-preserving.
    Type: Article , PeerReviewed
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  • 2
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    Secretion and excretion of calcium by the human gastrointestinal tract (1964)
    Elsevier
    In:  The Journal of Laboratory and Clinical Medicine , 64 (1). pp. 29-41.
    Details
    Publication Date: 2022-01-06
    Description: Fecal excretion of calcium of endogenous origin has been measured in 52 studies in 33 adult human subjects, under full metabolic balance conditions. Endogenous fecal calcium averaged .130 ± .047 Gm. per day, was positively correlated with both fecal calcium and dietary calcium and was inversely correlated with fractional calcium absorption. The regression line relating endogenous fecal calcium with fractional absorption allowed estimates for total intestinal calcium secretion at both zero and 100 per cent absorption; from these estimates it was calculated that approximately 15 per cent of the total intestinal calcium secretion was nonabsorbable even under conditions when dietary calcium was completely absorbed (presumably because it enters the gut caudad of the absorption sites). Total intestinal calcium secretion, calculated so as to allow for this nonabsorbable fraction, averaged .194 ± .073 Gm. per day, and could not be correlated with age, sex, dietary calcium intake, caloric intake, urine calcium, or plasma calcium. A weak correlation with body size (weight, surface area) was observed. The conditions studied were principally disorders of bone, calcium, and parathyroid metabolism, and in most of them total intestinal calcium secretion appeared identical. The sole exception was seen in two studies on a patient with acromegaly, in which total intestinal calcium secretion was over twice the mean value for the remainder of the group.
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  • 3
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    A double isotope method for measurement of intestinal absorption of calcium in man (1965)
    Elsevier
    In:  The Journal of Laboratory and Clinical Medicine , 66 (5). pp. 822-829.
    Details
    Publication Date: 2022-01-06
    Description: Calcium absorbtion was measured in fasting human beings after oral administration of Ca^45 in a solution containing 10 to 500mg stable calcium and an intravenous dose of Ca^47. Absorbtion was determined from the ratio of specific activities of the two isotopes (oral dose/intravenous dose) in calcium of urine collected more than 24 hours later. The accuracy of this calculation was confirmed by comparison with absorbtion calculated from recovery of the oral dose in stools (the completeness of collection being determined from recovery of simultaneously given Cr2O2or Cr^51 labeled protein and a correction for endogenous calcium being made from the fecal recovery of the intravenouse dose of Ca^47). In 20 tests, the average difference between the two calculations of per cent absorbtion was 2.2 and the coefficient of variation, 1.6. The Conditions under which the double isotope procedure gives an accurate result were evaluated and the results of its use with 3 different doses of calcium given to normal subjects are reported
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  • 4
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    A hypothesis concerning cyclic flow of salt water related to geothermal heating in the Floridan aquifer (1965)
    Wiley
    In:  Transactions of the New York Academy of Sciences, 28 (2). pp. 249-271.
    Details
    Publication Date: 2020-05-04
    Description: This paper summarizes the hydrogeology of the thick carbonate-evaporite sequence that extends from land surface to the oil horizons at depths of about 11,500 feet below sea level in southern Florida. It sets forth the few known facts about the hydrology of the deep water-bearing rocks and discusses a hypothesis concerning the cyclic flow of salt water related to geothermal heating in the Floridan aquifer. Meinzer (1923, p. 30) defined an aquifer as a "formation, a group of formations, or part of a formation that is water bearing." The connotation of quantity was included by the statement: "Few if any formations are entirely devoid of gravity ground water, but those that do not contain enough to be of consequence as a source of supply are not rated as water bearing." The quality of the water does not enter the definition, for if it did, a change in quality (as by salt-water encroachment) would correspondingly convert aquifers to nonaquifers. This paper treats permeable water-bearing beds as aquifers even though the contained water might be a brine seven times as salty as sea water and, therefore, normally not considered a source of supply.
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  • 5
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    Hot brines and recent iron deposits in deeps of the Red Sea (1966)
    Elsevier
    In:  Geochimica et Cosmochimica Acta, 30 (3). pp. 341-359.
    Details
    Publication Date: 2020-01-09
    Description: Sedimentary iron and heavy-metal deposits of undetermined size have been found in the middle of the Red Sea some 2000 meters below the surface of the sea (Fig. 1). This discovery has been made from the Research Vessel Atlantis II, which is still at sea engaged in a series of oceanographic investigations which ultimately will end in November 1965, after the ship has circumnavigated the globe. The discovery is significant because the environment and the processes controlling deposition of heavy metals are observable and appear to be still active.
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  • 6
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    Methods of Sampling the Benthos (1964)
    Elsevier
    In:  Advances in Marine Biology, 2 . pp. 171-260.
    Details
    Publication Date: 2019-09-13
    Description: This chapter throws the attention on the methods of sampling the benthos, which has been directed mainly to the operation of the gear at sea and to such other factors as may influence sampling methods. This chapter briefly traces the history of benthos investigations, and then considers how far the instruments now available provide with the quantitative samples. It also shows how advances in other fields, such as radio-position finding, sonar and electronic equipment have increased the precision of our sampling methods. Moreover, sorting and sieving on board ship can be considered and brief mention made of methods of soil analysis and biomass determination. This chapter discusses the two possible approaches for the development of satisfactory quantitative collecting methods. First the improvement of the grab-type of instrument, with particular reference to increasing penetration and the perfection of release gear for the open sea, and second; the development of a wide-core sampler, like the Knudsen sampler, which works satisfactorily in the open sea. Moreover, statistics need to be even more fully applied, where collecting methods justify them, to such problems as the degree and scale of dispersion of individuals.
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  • 7
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    Rostra of cephalopods in oceanic bottom sediments (1964)
    Elsevier
    In:  Deep Sea Research and Oceanographic Abstracts, 11 (1). pp. 113-126.
    Details
    Publication Date: 2017-05-12
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  • 8
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    On the fine structure of density and current distribution and its short-time variations in different areas (1969)
    Elsevier
    In:  Progress in Oceanography, 5 . pp. 81-94.
    Details
    Publication Date: 2016-10-07
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  • 9
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    The major deep-sea expeditions and research vessels 1873-1960 : a contribution to the history of oceanography (1964)
    Elsevier
    In:  Progress in Oceanography, 2 . pp. 1-52.
    Details
    Publication Date: 2016-10-07
    Description: Reviews the major deep-sea expeditions from that of HMS Challenger in 1873 to 1960. Emphasis is on the increasing sophistication of vessels and equipment used, the growth of international cooperation and the proliferation of branches of oceanographic studies. Arctic work by Nansen, Sverdrup, recent Soviet scientists, the Scripps Institution and the Norpac program are mentioned (maps). Vessels used during the period and their activities are tabulated. Two maps show cruises of the Atlantic Polar Front Program Jan-Dec 1958 in the Greenland and Barents Seas
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  • 10
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    On the in situ measurement of temperature and electrical conductivity of sea-water (1963)
    Elsevier
    In:  Deep Sea Research and Oceanographic Abstracts, 10 (3). pp. 269-277.
    Details
    Publication Date: 2016-09-22
    Description: After some brief comments on the measurement of temperature and electrical conductivity in oceanography, the measuring probes suitable for in situ measurements are reviewed. Then the method of measurement is described using an improved model of the so-called bathysonde. This makes possible a continuous recording of temperature, conductivity, and pressure with high accuracy in great depths. Measurements from the Skagerrak and from the Mediterranean are considered. Finally, problems are discussed which arise when evaluating electrical conductivity and temperature from in situ measurements.
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