Ludwig Mayer, a prominent collector of minerals and his collection in the National Museum in Prague

2018 ◽  
Vol 187 (1) ◽  
pp. 65-84
Author(s):  
Miroslav Radoň ◽  
Dalibor Velebil
Keyword(s):  
National Museum ◽  
The Core ◽  
Geological Conditions ◽  
Central Highlands

Ludwig Mayer (*1879, †?) was an significant collector of minerals from Bílina near Teplice. He personally searched minerals in terrain. He also purchased large amount of minerals from dealers or exchanged with other collectors. He deserved a number of interesting or completely new mineralogical findings, which were enriching the overall knowledge of mineralogical conditions of the Bohemian Central Highlands. Many of his findings were published by profesor Josef Emanuel Hibsch (*1852, †1940), the greatest expert on geological conditions of the Bohemian Central Highlands. From 1939 to 1945 Mayer was the manager of geological collections of the museum in Teplice. A total of 596 pieces of minerals from the Mayer’s collection came to the systematic part of the mineralogical collection of the National Museum in Prague. The core of this amount consists of documentary valuable minerals from several important mineralogical sites of the Central Bohemian Highlands, such as Dolní Zálezly, Církvice, Mariánská Rock in Ústí nad Labem, Radejčín and new site Chudoslavice with yellow crystals of chabazite, discovered by Mayer. A total of 54 samples of minerals from the Mayer collection were selected for the newly prepared permanent exhibition of minerals of the National Museum in Prague.

scholarly journals Wall texts in collection exhibitions. Bastions of enlightenment and interfaces for experience

1970 ◽  
pp. 39-50
Author(s):  
Palmyre Pierroux ◽  
Anne Christiansen Qvale
Keyword(s):  
Art Museum ◽  
Art Museums ◽  
National Museum ◽  
The Core ◽  
Communication Practices ◽  
Media And Communication ◽  
Point Of Departure

Taking the wall text in art museums as point of departure, this article investigates developments in museum media and communication practices in the exhibition room. We first present findings from a recent study of types and functions of wall texts used in permanent collection exhibitions in twelve Norwegian art museums, including a national museum of art. We then examine the types and functions of wall texts being planned and designed for the collection exhibitions in a new building for this national art museum, which will open in 2020. In our analytical focus on the wall text, we unpack how perspectives on enlightenment and experience become institutionally embedded in the interface of interpretive media. The study showed small but significant changes in a national art museum’s organization, a new blended approach to digital interpretive media, and expanded types of wall texts, illustrating the premise that discursive and practical tensions between enlightenment and experience are at the core of new practices emerging in museums.

Method for Making Artificial Core Using Dry Cement as Cementing Agent

2014 ◽  
Vol 997 ◽  
pp. 387-391 ◽  
Author(s):  
Xian Ming Chen ◽  
Yong Zhang
Keyword(s):  
The Core ◽  
Saturated Water ◽  
Core Technology ◽  
Geological Conditions ◽  
Flow Experiment ◽  
Temperature And Pressure ◽  
Permeability Variation ◽  
Core Permeability ◽  
The Relationship ◽  
Cementing Agent

As the core and geological conditions is poor, it is difficult to get ideal cores for the laboratory flow experiment, especially for the weak bonding natural sandstone core and core resources affects the evaluation experiment. This paper describes the use of cement as cementing agent to make artificial sandstone core technology. Based on the principle of cementation solidifying when cement meets water in normal temperature and pressure conditions, using the cement as the cementing agent , contrasting different proportion of cement and core permeability to obtained the relationship curve . With the decrease of the proportion of cement, the cementation gradually weakened. When the ratio is less than 10 than 1, the core permeability variation in saturated water or not is certain, maintained at around 5%.

scholarly journals Core recovery criterion – a new optimization method of geological information quality in the geological conditions of the Grodziec Syncline Area

2016 ◽  
Vol 32 (4) ◽  
pp. 91-108
Author(s):  
Daniel Janc ◽  
Rafał Wiśniowski ◽  
Stanisław Stryczek
Keyword(s):  
Information Quality ◽  
Optimization Method ◽  
Drilling Mud ◽  
The Core ◽  
Core Recovery ◽  
Geological Conditions ◽  
Geological Information ◽  
Momentary Rate ◽  
Weight On Bit ◽  
The Mathematical Model

Abstract The increasing requirements for the quality and amount of geological information induce the development of new technological solutions. The authors present the optimization of the coring method for a newly defined criterion of maximum geological information quality. It enables the efficiency of works to be improved without investing in new specialist and expensive equipment. The statistical classification methods commonly used in medicine and the economy were used for analyzing the homogeneity of the drilled rocks. The quadratic discriminant analysis (QDA) and the Naive Bayes classifier method turned out to be most efficient, therefore they were selected from among other methods differing in the way the classification rules are built. The newly defined criterion of maximum geological information quality and the mathematical model of maximum core recovery allowed the amount and the quality of recovered rock material in the geologic conditions of the Grodziec Syncline to be incresed. The control of the process relied on detecting phenomena responsible for core damaging, i.e. erosiveness of drilling mud, mechanical damaging due to jamming in the core barrel and unstable operation of the core bit downhole. The analysis revealed that the main factor influencing the lower recovery of cores is mechanical damaging due to jamming in the core barrel. For the sake of controlling the core recovery, the authors defined and used the jamming index which defines the effect of weight on bit on momentary rate of penetration. The efficiency of this method was proved by a test performed in industrial conditions while drilling a successive wellbore in the Grodziec Syncline. This paper was written on the basis of own experience and analyses performed by the authors while conducting works in the Grodziec Syncline in the South West Poland.

scholarly journals Virtual Embryology

1999 ◽  
Vol 7 (4) ◽  
pp. 3-4
Author(s):  
Stephen W. Carmichael
Keyword(s):  
Embryonic Development ◽  
Armed Forces ◽  
Human Embryos ◽  
Educational Resource ◽  
National Museum ◽  
The Core ◽  
Human Embryos And Fetuses

Old embryos are now being looked at in a new way. About a hundred years ago, an embryologist by the name of FranMyn Paine Mall devoted his career to collecting human embryos and fetuses (an embryo becomes a fetus after 2 months of gestation) from miscarriages and abortions. These specimens form the core of what is known today as the Carnegie Collection of Human Embryos, housed in the National Museum of Health and Medicine of the Armed Forces Institute of Pathology in Washington, D.C. Whereas this is a priceless national educational resource, how do we extract the information about our embryonic development from these specimens? Classic techniques involve slicing a specimen as thinly as possible on a microtome, then reconstructing the slices in a model large enough to study. The problem is the specimen is effectively destroyed in the process. What is needed is a technique that allows whole embryos to be examined, but not destroyed.

Major nappe-like D2 folds in the Dalradian rocks of the Beinn Udlaidh area, Central Highlands, Scotland

2009 ◽  
Vol 100 (04) ◽  
pp. 371-389 ◽  
Author(s):  
P. W. Geoff Tanner ◽  
Peter R. Thomas
Keyword(s):  
Spatial Distribution ◽  
Regional Scale ◽  
Scale Structure ◽  
The Core ◽  
Metamorphic Peak ◽  
Lower Ordovician ◽  
Central Highlands ◽  
Inclusion Trails ◽  
Maximum Development ◽  
Structural Continuity

ABSTRACTTwo regional-scale, recumbent folds control the structure of the Beinn Udlaidh area, Tyndrum, Perthshire. They reached their maximum development during D2, following the regional metamorphic peak, and are part of a stack of larger SE-facing recumbent folds formed during the ∼470 Ma Grampian Orogeny. The rocks belong to the Neoproterozoic–Lower Ordovician Dalradian Supergroup, and preserve a sedimentary transition between the Grampian Group and the overlying Appin Group. The latter occupies the core of the S-facing, recumbent Beinn Udlaidh Syncline (D2) which, with the underlying complementary Glen Lochy Anticline, is gently folded by a regional-scale structure, the Orchy Dome. The recumbent folds postdate an early fabric (S1), which is generally obliterated by the D2 imprint, but preserved as inclusion trails in regional metamorphic garnets, that are highly oblique to, and wrapped by, S2. It is concluded that the Dalradian rocks described here from below the Iltay Boundary Slide are in structural continuity with those of the Tay Nappe above, and that the Slide represents a structurally-modified disconformity between the Leven Schist (Appin Group) and the overlying Ben Lui Schist (Argyll Group). The Orchy Dome probably influenced the spatial distribution of minor intrusions and explosion vents of the lamprophyre suite.

THE EARLY KURGAN PERIOD IN RABATI, GEORGIA: THE CULTURAL SEQUENCE AND A NEW SUITE OF RADIOCARBON DATES

Radiocarbon ◽  
2021 ◽  
pp. 1-41
Author(s):  
Giorgi Bedianashvili ◽  
Andrew Jamieson ◽  
Claudia Sagona
Keyword(s):  
Bronze Age ◽  
Collaborative Research ◽  
Early Bronze Age ◽  
National Museum ◽  
Research Project ◽  
The Caucasus ◽  
Radiocarbon Dates ◽  
The Core ◽  
The University

Abstract This paper reports on radiocarbon (14C) results from the recent archaeological investigations in the ancient frontier fortress of Rabati, in southwest Georgia, a collaborative research project involving archaeologists from the Georgian National Museum and the University of Melbourne. From the first three excavation seasons spanning 2016, 2018, and 2019, it became clear that significant Bedeni phase deposits capped most of the summit of the site. Levels with their distinctive vessels and a range of contemporary, local domestic wares, pits and some traces of architecture seal underlying Early Bronze Age strata. The Early Bronze Age levels include massive architecture rarely seen in Kura-Araxes settlements. Some finds can only be described as unique and extraordinary while others suggest that the core population was stable with long-held traditions, yet open to new influences infiltrating this highland site during the subsequent Early Kurgan (Martkopi-Bedeni) period. We discuss the key discoveries at Rabati relative to the 14C readings from the site within the wider setting of contemporary sites in the Caucasus.

What face familiarity feelings say about the lateralization of specific entities within the core system

2019 ◽  
Vol 42 ◽  
Author(s):  
Guido Gainotti
Keyword(s):  
Temporal Lobe ◽  
Memory System ◽  
Core System ◽  
The Core ◽  
Memory Traces ◽  
Specific Memory ◽  
Target Article ◽  
Temporal Structures ◽  
The Right

Abstract The target article carefully describes the memory system, centered on the temporal lobe that builds specific memory traces. It does not, however, mention the laterality effects that exist within this system. This commentary briefly surveys evidence showing that clear asymmetries exist within the temporal lobe structures subserving the core system and that the right temporal structures mainly underpin face familiarity feelings.

A scanning electron microscopic study on dissolving process of cholesterol gallstones by chenodeoxycholic acid (CDCA)

1978 ◽  
Vol 36 (2) ◽  
pp. 522-523
Author(s):  
T. Kanetaka ◽  
M. Cho ◽  
S. Kawamura ◽  
T. Sado ◽  
K. Hara
Keyword(s):  
Electron Microscope ◽  
Chenodeoxycholic Acid ◽  
Outer Surface ◽  
Electron Microscopic ◽  
Cholesterol Gallstones ◽  
The Core ◽  
Scanning Electron Microscopic Study ◽  
Scanning Electron Microscopic ◽  
Acceleration Voltage ◽  
Scanning Electron

The authors have investigated the dissolution process of human cholesterol gallstones using a scanning electron microscope(SEM). This study was carried out by comparing control gallstones incubated in beagle bile with gallstones obtained from patients who were treated with chenodeoxycholic acid(CDCA).The cholesterol gallstones for this study were obtained from 14 patients. Three control patients were treated without CDCA and eleven patients were treated with CDCA 300-600 mg/day for periods ranging from four to twenty five months. It was confirmed through chemical analysis that these gallstones contained more than 80% cholesterol in both the outer surface and the core.The specimen were obtained from the outer surface and the core of the gallstones. Each specimen was attached to alminum sheet and coated with carbon to 100Å thickness. The SEM observation was made by Hitachi S-550 with 20 kV acceleration voltage and with 60-20, 000X magnification.

The Structure and Development of Microbodies in the Fat Body and other Tissues of an Insect (Calpodes Ethlius)

1970 ◽  
Vol 28 ◽  
pp. 148-149
Author(s):  
M. Locke ◽  
J. T. McMahon
Keyword(s):  
Electron Microscopy ◽  
Liquid Crystals ◽  
Fat Body ◽  
Competitive Inhibitor ◽  
Dense Core ◽  
Urate Oxidase ◽  
Blood Proteins ◽  
Free Base ◽  
The Core ◽  
The Matrix

The fat body of insects has always been compared functionally to the liver of vertebrates. Both synthesize and store glycogen and lipid and are concerned with the formation of blood proteins. The comparison becomes even more apt with the discovery of microbodies and the localization of urate oxidase and catalase in insect fat body.The microbodies are oval to spherical bodies about 1μ across with a depression and dense core on one side. The core is made of coiled tubules together with dense material close to the depressed membrane. The tubules may appear loose or densely packed but always intertwined like liquid crystals, never straight as in solid crystals (Fig. 1). When fat body is reacted with diaminobenzidine free base and H2O2 at pH 9.0 to determine the distribution of catalase, electron microscopy shows the enzyme in the matrix of the microbodies (Fig. 2). The reaction is abolished by 3-amino-1, 2, 4-triazole, a competitive inhibitor of catalase. The fat body is the only tissue which consistantly reacts positively for urate oxidase. The reaction product is sharply localized in granules of about the same size and distribution as the microbodies. The reaction is inhibited by 2, 6, 8-trichloropurine, a competitive inhibitor of urate oxidase.

Exsolution and inversion in pigeonite from the Whin Sill, Northern England

1978 ◽  
Vol 36 (1) ◽  
pp. 474-475
Author(s):  
P.P.K. Smith
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Homogeneous Nucleation ◽  
Silicate Mineral ◽  
Antiphase Boundaries ◽  
Two Phase ◽  
Primitive Form ◽  
The Core ◽  
Nucleation Mechanisms ◽  
And Inversion

Grains of pigeonite, a calcium-poor silicate mineral of the pyroxene group, from the Whin Sill dolerite have been ion-thinned and examined by TEM. The pigeonite is strongly zoned chemically from the composition Wo8En64FS28 in the core to Wo13En34FS53 at the rim. Two phase transformations have occurred during the cooling of this pigeonite:- exsolution of augite, a more calcic pyroxene, and inversion of the pigeonite from the high- temperature C face-centred form to the low-temperature primitive form, with the formation of antiphase boundaries (APB's). Different sequences of these exsolution and inversion reactions, together with different nucleation mechanisms of the augite, have created three distinct microstructures depending on the position in the grain.In the core of the grains small platelets of augite about 0.02μm thick have farmed parallel to the (001) plane (Fig. 1). These are thought to have exsolved by homogeneous nucleation. Subsequently the inversion of the pigeonite has led to the creation of APB's.

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