An Inscribed Marble Portrait-Herm in the British Museum

1953 ◽  
Vol 73 ◽  
pp. 138-139
Author(s):  
D. E. L. Haynes
Keyword(s):  
British Museum ◽  
Coarse Grained ◽  
Total Height ◽  
Left Flank ◽  
Complete Figure ◽  
Antique Dealer

Pl. V and figs. 1–3 illustrate a small inscribed portrait-herm recently acquired by the Trustees of the British Museum, to whom thanks are due for permission to publish it here. It was discovered in 1948 in the lumber-room of a Kentish antique-dealer, but nothing more is known of its history. The material is a coarse-grained, rather grey marble which resembles specimens from Proconnesus. The total height of the herm is 22 inches (56 cm.); from the top of the inscription panel to the top of the head measures 8 ½ inches (21.5 cm.). The tip of the nose part of a cloak thrown over one of the shoulders, more probably the left, since this is the shoulder over which the cloak is normally draped. The notch, to judge from its position, was part of the lowest linea transversa on the left flank. In its general pose the figure must have been close to the type of the Belvedere Hermes. From shoulder to fork it measured roughly 21·5 inches (541·5 cm.), from which we may estimate that the complete figure stood just over 4 feet high (11·20 m.).

scholarly journals A Quartz-Eyed-Gneiss from Mesopotamia

1922 ◽  
Vol 59 (5) ◽  
pp. 222-223
Author(s):  
Hans Reusch
Keyword(s):  
Igneous Rock ◽  
British Museum ◽  
Coarse Grained ◽  
Coarse Grain ◽  
Characteristic Variety ◽  
Quartz Grains

The great winged man-lions from Mesopotamia are some of the most conspicuous and most wonderful objects in the British Museum. When visiting that museum last September I was greatly interested as a geologist in examining the kind of rock of which they are composed. This rock is, I suppose, usually taken to be a granite, but it is not an igneous rock. On the contrary, it is of sedimentary origin, a felspathic sandstone (arkose or sparagmite) of very coarse grain, almost bordering on a conglomerate. In the most characteristic variety, from the palace of Sargon, the chief constituentis white quartz in lumps varying in size between that of a hazel-nut and an apple (see Fig. 1). These are embedded in a cement of coarse-grained sparagmite. A notable peculiarity is thatthe fragments of quartz have very irregular contours, giving the appearance of an invasion of the larger fragments by the groundmass. In other varieties (Palace of Assurbanipal) the fragments of quartz are smaller and may in some cases show no distinction from the quartz-grains of the groundmass.

The Alteration of the Pore Spaces in Sandstones

1973 ◽  
Vol 31 ◽  
pp. 210-211
Author(s):  
R. E. Ferrell ◽  
G. G. Paulson
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
The Other ◽  
Coarse Grained ◽  
Depositional Fabric ◽  
Soluble Components ◽  
Scanning Electron ◽  
Shape And Size

The pore spaces in sandstones are the result of the original depositional fabric and the degree of post-depositional alteration that the rock has experienced. The largest pore volumes are present in coarse-grained, well-sorted materials with high sphericity. The chief mechanisms which alter the shape and size of the pores are precipitation of cementing agents and the dissolution of soluble components. Each process may operate alone or in combination with the other, or there may be several generations of cementation and solution.The scanning electron microscope has ‘been used in this study to reveal the morphology of the pore spaces in a variety of moderate porosity, orthoquartzites.

On the Origin of the Microscystalline Structure in Rapidly Solidified IN-100 Powder

1977 ◽  
Vol 35 ◽  
pp. 260-261
Author(s):  
J. M. Walsh ◽  
K. P. Gumz ◽  
J. C. Whittles ◽  
B. H. Kear
Keyword(s):  
The Other ◽  
Coarse Grained ◽  
Microcrystalline Structure ◽  
Routine Examination ◽  
Atomization Process ◽  
Centrifugal Atomization ◽  
Splat Quenching ◽  
Powder Particles ◽  
Dendritic Microstructures ◽  
Rapidly Solidified

During a routine examination of the microstructure of rapidly solidified IN-100 powder, produced by a newly-developed centrifugal atomization process1, essentially two distinct types of microstructure were identified. When a high melt superheat is maintained during atomization, the powder particles are predominantly coarse-grained, equiaxed or columnar, with distinctly dendritic microstructures, Figs, la and 4a. On the other hand, when the melt superheat is reduced by increasing the heat flow to the disc of the rotary atomizer, the powder particles are predominantly microcrystalline in character, with typically one dendrite per grain, Figs, lb and 4b. In what follows, evidence is presented that strongly supports the view that the unusual microcrystalline structure has its origin in dendrite erosion occurring in a 'mushy zone' of dynamic solidification on the disc of the rotary atomizer.The critical observations were made on atomized material that had undergone 'splat-quenching' on previously solidified, chilled substrate particles.

Correlation between dislocation, grain boundary and interface of duplex SS in stress corrosion cracking(SCC)

1990 ◽  
Vol 48 (4) ◽  
pp. 928-929
Author(s):  
Wang Zheng-fang ◽  
Z.F. Wang
Keyword(s):  
Stainless Steel ◽  
Thermal Cycle ◽  
Secondary Phase ◽  
Corrosion Cracking ◽  
Coarse Grained ◽  
Test Environment ◽  
Fine Grained ◽  
Evaluation Test ◽  
Welding Thermal Cycle ◽  
Micro Analysis

The main purpose of this study highlights on the evaluation of chloride SCC resistance of the material,duplex stainless steel,OOCr18Ni5Mo3Si2 (18-5Mo) and its welded coarse grained zone(CGZ).18-5Mo is a dual phases (A+F) stainless steel with yield strength:512N/mm2 .The proportion of secondary Phase(A phase) accounts for 30-35% of the total with fine grained and homogeneously distributed A and F phases(Fig.1).After being welded by a specific welding thermal cycle to the material,i.e. Tmax=1350°C and t8/5=20s,microstructure may change from fine grained morphology to coarse grained morphology and from homogeneously distributed of A phase to a concentration of A phase(Fig.2).Meanwhile,the proportion of A phase reduced from 35% to 5-10°o.For this reason it is known as welded coarse grained zone(CGZ).In association with difference of microstructure between base metal and welded CGZ,so chloride SCC resistance also differ from each other.Test procedures:Constant load tensile test(CLTT) were performed for recording Esce-t curve by which corrosion cracking growth can be described, tf,fractured time,can also be recorded by the test which is taken as a electrochemical behavior and mechanical property for SCC resistance evaluation. Test environment:143°C boiling 42%MgCl2 solution is used.Besides, micro analysis were conducted with light microscopy(LM),SEM,TEM,and Auger energy spectrum(AES) so as to reveal the correlation between the data generated by the CLTT results and micro analysis.

Input of coarse-grained siliciclastics into the Pyrenean Basin during the PETM (1): overview

2014 ◽  
Vol 31 ◽  
pp. 177-178
Author(s):  
Victoriano Pujalte ◽  
Juan Ignacio Baceta ◽  
Birger Schmitz
Keyword(s):  
Coarse Grained

Patterns in diversity and composition of the microbenthos of subarctic intertidal beaches with different morphodynamics

2020 ◽  
Vol 648 ◽  
pp. 19-38
Author(s):  
AI Azovsky ◽  
YA Mazei ◽  
MA Saburova ◽  
PV Sapozhnikov
Keyword(s):  
Species Abundance ◽  
Abundance Ratio ◽  
Wave Action ◽  
Coarse Grained ◽  
Sediment Properties ◽  
Β Diversity ◽  
Α Diversity ◽  
Wide Range ◽  
Similar Mode ◽  
Abundance And Diversity

Diversity and composition of benthic diatom algae and ciliates were studied at several beaches along the White and Barents seas: from highly exposed, reflective beaches with coarse-grained sands to sheltered, dissipative silty-sandy flats. For diatoms, the epipelic to epipsammic species abundance ratio was significantly correlated with the beach index and mean particle size, while neither α-diversity measures nor mean cell length were related to beach properties. In contrast, most of the characteristics of ciliate assemblages (diversity, total abundance and biomass, mean individual weight and percentage of karyorelictids) demonstrated a strong correlation to beach properties, remaining low at exposed beaches but increasing sharply in more sheltered conditions. β-diversity did not correlate with beach properties for either diatoms or ciliates. We suggest that wave action and sediment properties are the main drivers controlling the diversity and composition of the intertidal microbenthos. Diatoms and ciliates, however, demonstrated divergent response to these factors. Epipelic and epipsammic diatoms exhibited 2 different strategies to adapt to their environments and therefore were complementarily distributed along the environmental gradient and compensated for each other in diversity. Most ciliates demonstrated a similar mode of habitat selection but differed in their degree of tolerance. Euryporal (including mesoporal) species were relatively tolerant to wave action and therefore occurred under a wide range of beach conditions, though their abundance and diversity were highest in fine, relatively stable sediments on sheltered beaches, whereas the specific interstitial (i.e. genuine microporal) species were mostly restricted to only these habitats.

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