scholarly journals Notes upon late Anatolian Art

1898 ◽  
Vol 4 ◽  
pp. 79-94
Author(s):  
J. W. Crowfoot
Keyword(s):  
Central Field ◽  
Considerable Size

Phrygia is remarkable for the variety (and number) of its funeral monuments: in one place the sarcophagus, in another the altar, in a third the stele. The last named was fashionable in the land of the Praipenissians, whose ancient centre was Soa in the neighbourhood of Altyn Tash. The Phrygian stele was often of considerable size, six feet or more in height, and fixed upright in the ground or in a socket by a wedge-like tongue, which still remains in some cases.The central field is filled sometimes by figures of the deceased, often more than life-size, never by ridiculous little dolls such as are found further east. The place of the figures is sometimes taken by a door: in this case the busts of the departed are occasionally sculptured in an arch-shaped pediment above (cf. Texier, Description de I'Asie Mineure, Pls. 38, 51). Otherwise the pediment is filled by various symbolic or decorative subjects—two lions with a prostrate bull or merely its head between them, an eagle with wings “displayed,” dolphins with small fishes in their mouths, and in one case Herakles and Cerberus.

CHASSIS DESIGN & PERFORMANCE ANALYSIS FOR THE EUROPEAN EXOMARS ROVER

2005 ◽  
Vol 29 (4) ◽  
pp. 507-517
Author(s):  
Alex Ellery ◽  
Lutz Richter ◽  
Reinhold Bertrand
Keyword(s):  
Performance Analysis ◽  
Weight Distribution ◽  
High Performance ◽  
High Mobility ◽  
Scientific Instrument ◽  
Equal Weight ◽  
Scientific Instruments ◽  
Design Issues ◽  
Martian Surface ◽  
Considerable Size

The European Space Agency’s (ESA) ExoMars rover has recently been subject to a Phase A study led by EADS Astrium, UK. This rover mission represents a highly ambitious venture in that the rover is of considerable size ~200+kg with high mobility carrying a highly complex scientific instrument suite (Pasteur) of up to 40 kg in mass devoted to exobiological investigation of the Martian surface and sub-surface. The chassis design has been a particular challenge given the inhospitable terrain on Mars and the need to traverse such terrain robustly in order to deliver the scientific instruments to science targets of exobiological interest, We present some of the results and design issues encountered during the Phase A study related to the chassis. In particular, we have focussed on the overall tractive performance of a number of candidate chassis designs and selected the RCL (Science & Technology Rover Company Ltd in Russian) concept C design as the baseline option in terms of high performance with minimal mechanical complexity overhead. This design is a six-wheeled double-rocker bogie design to provide springless suspension and maintain approximately equal weight distribution across each wheel.

Erratum: Perturbation theory for a Dirac particle in a central field

1981 ◽  
Vol 23 (3) ◽  
pp. 1561-1561
Author(s):  
C. K. Au ◽  
G. W. Rogers
Keyword(s):  
Perturbation Theory ◽  
Dirac Particle ◽  
Central Field

scholarly journals I. A contribution to the anatomy of the ductless glands and lymphatic system of the angler fish ( Lophius piscatorius )

1927 ◽  
Vol 215 (421-430) ◽  
pp. 1-56 ◽  
Keyword(s):  
Connective Tissue ◽  
Lymphatic System ◽  
Loose Connective Tissue ◽  
Mode Of Life ◽  
Better Than ◽  
Considerable Size

The Angler ( Lophius piscatorius ) is a fish much modified for a bottom habit, and apart from many peculiarities of form and structure associated with this particular mode of life, is remarkable for the looseness of its skin and the abundance of soft connective tissue that separates it from the underlying fascia and muscles. Within this layer of loose connective tissue lie many of the larger trunks of the lymphatic system, mostly of very considerable size and easy to inject. The fish thus furnishes material better than most for the study of this system.

A Hand-axe from beneath the Norwich Crag

1930 ◽  
Vol 6 (3) ◽  
pp. 222-225
Author(s):  
J. Reid Moir
Keyword(s):  
Presidential Address ◽  
British Museum ◽  
Point Of View ◽  
Accurate Description ◽  
Considerable Size

In his important Presidential Address, dealing, principally, with the diggings he carried out beneath the Norwich Crag, Mr. J. E. Sainty drew attention to a remarkable flint implement (Fig. 2 of the above-mentioned paper) which was found by Mr. T. F. Newnam in the well-known pit at Whitlingham, near Norwich. After haying shewn that the specimen was derived from the pre-Crag Stone Bed, Mr. Sainty gave a careful and accurate description of this implement, and concluded by stating, “It is altogether a very convincing and highly important specimen from the point of view of dating the industry which it represents.”There are, I imagine, few archæologists who, having examined this implement, would disagree with Mr. Sainty's opinion. The specimen is, in fact, of such great significance that it was considered desirable to have it illustrated in four views, and this has now been successfully accomplished by Mr. C. O. Waterhouse, of the British Museum. Mr. Sainty has been so good as to ask me to undertake the task of further describing, and of commenting upon, this implement, and I am indebted to the Curator of the Castle Museum, Norwich, where the flint is now preserved, for loaning it to me for examination. If attention is now directed to Figs. 1, 2, 3 and 4, it will be at once realised that the specimen found by Mr. Newnam is a coarsely-flaked and massive (it weighs 2¼ lbs.) hand-axe. A further examination will show that the flaking which has shaped the implement has been produced by heavy, though skilful blows delivered by a hammerstone of considerable size and weight. It is clear, also, that the specimen was formed by means of what is known as ‘free’ flaking, in which the side from which the flakes are to be removed is not supported by pressure of the hand, or some other object. The result of the application of the above described technique is the removal of flakes inclined to be thick, and showing prominent bulbs of percussion, and of greater breadth than length.

Stochastic Motion in a Central Field with a Weak Non—Rotating Bar Perturbation

1995 ◽  
pp. 537-543 ◽  
Author(s):  
Pablo M. Cincotta ◽  
Josué A. Núñez ◽  
Juan C. Muzzio
Keyword(s):  
Central Field ◽  
Stochastic Motion

Azimuthal sensitivity of neurons in primary auditory cortex of cats. II. Organization along frequency-band strips

1990 ◽  
Vol 64 (3) ◽  
pp. 888-902 ◽  
Author(s):  
R. Rajan ◽  
L. M. Aitkin ◽  
D. R. Irvine
Keyword(s):  
Spatial Distribution ◽  
Auditory Cortex ◽  
Frequency Band ◽  
Primary Auditory Cortex ◽  
Companion Paper ◽  
Significant Feature ◽  
Central Field ◽  
Cortical Surface ◽  
Peak Response ◽  
The Individual

1. The organization of azimuthal sensitivity of units across the dorsoventral extent of primary auditory cortex (AI) was studied in electrode penetrations made along frequency-band strips of AI. Azimuthal sensitivity for each unit was represented by a mean azimuth function (MF) calculated from all azimuth functions obtained to characteristic frequency (CF) stimuli at intensities 20 dB or more greater than threshold. MFs were classified as contrafield, ipsi-field, central-field, omnidirectional, or multipeaked, according to the criteria established in the companion paper (Rajan et al. 1990). 2. The spatial distribution of three types of MFs was not random across frequency-band strips: for contra-field, ipsi-field, and central-field MFs there was a significant tendency for clustering of functions of the same type in sequentially encountered units. Occasionally, repeated clusters of a particular MF type could be found along a frequency-band strip. In contrast, the spatial distribution of omnidirectional MFs along frequency-band strips appeared to be random. 3. Apart from the clustering of MF types, there were also regions along a frequency-band strip in which there were rapid changes in the type of MF encountered in units isolated over short distances. Most often such changes took the form of irregular, rapid juxtapositions of MF types. Less frequently such changes appeared to show more systematic changes from one type of MF to another type. In contrast to these changes in azimuthal sensitivity seen in electrode penetrations oblique to the cortical surface, much less change in azimuthal sensitivity was seen in the form of azimuthal sensitivity displayed by successively isolated units in penetrations made normal to the cortical surface. 4. To determine whether some significant feature or features of azimuthal sensitivity shifted in a more continuous and/or systematic manner along frequency-band strips, azimuthal sensitivity was quantified in terms of the peak-response azimuth (PRA) of the MFs of successive units and of the azimuthal range over which the peaks occurred in the individual azimuth functions contributing to each MF (the peak-response range). In different experiments shifts in these measures of the peaks in successively isolated units along a frequency-band strip were found generally to fall into one of four categories: 1) shifts across the entire frontal hemifield; 2) clustering in the contralateral quadrant; 3) clustering in the ipsilateral quadrant; and 4) clustering about the midline. In two cases more than one of these four patterns were found along a frequency-band strip.(ABSTRACT TRUNCATED AT 400 WORDS)

On planar oscillations of a body with a variable mass distribution in an elliptic orbit

2011 ◽  
Vol 225 (10) ◽  
pp. 2288-2295 ◽  
Author(s):  
A Burov ◽  
I Kosenko
Keyword(s):  
Mass Distribution ◽  
Large Scale ◽  
Variable Mass ◽  
Relative Equilibria ◽  
The Body ◽  
Global Dynamics ◽  
Central Field ◽  
Attitude Dynamics ◽  
Orbital Eccentricity ◽  
Space Elevators

Planar motion of an orbiting body having a variable mass distribution in a central field of gravity is under analysis. Within the so-called ‘satellite approximation’ planar attitude dynamics is reduced to the 3/2-degrees of freedom description by one ODE of second order. The law of the mass distribution variations implying an existence of the special relative equilibria, such that the body is oriented pointing to the attracting centre by the same axis for any value of the orbit eccentricity is indicated. For particular example of an orbiting dumb-bell equipped by a massive cabin, wandering between the ends of the dumb-bell. For this example stability of the equilibria such that the dumb-bell ‘points to’ the attracting centre by one of its ends is studied. The chaoticity of global dynamics is investigated. Two important examples of a vibrating dumb-bell and of a dumb-bell equipped by a cabin wandering between its endpoints are considered. The dynamics of space objects, including moving elements, has been investigated by many authors. These studies usually have been connected with the necessity to estimate the influence of relative motions of moving parts, for example, crew motions [ 1 , 2 ], circulation of liquids [ 3 ], etc. on the attitude dynamics of a spacecraft. The development of projects of large-scale space systems with mobile elements, in particular, of satellite systems with tethered elements and space elevators, has posed problems related to their dynamics. Various aspects of the role of mass distribution even for the simplest orbiting systems, like dumb-bell systems are known since the publications [ 4 – 7 ], etc. The possibility of the sudden loss of stability because of the mass redistribution has been pointed out in reference [ 8 ] (see also references [ 9 – 13 ]). The considered system belongs to the mentioned class of systems and represents by itself one of the simplest systems allowing both analytical and numerical treatment, without supplementary simplifying assumptions such as smallness of the orbital eccentricity. Another set of applied problems is related to orientation keeping of the system for deployment and retrieval of tethered subsatellites as well as for relative cabin motions of space elevators. In particular, the problem of the stabilization/destabilization possibility for the given state of motion due to rapid oscillations of the cabin exists. This could be the subject of another additional investigation.

scholarly journals Art. XXVI.—Mineral Resources of Southern India. No. 8. Diamond Tracts

1843 ◽  
Vol 7 (14) ◽  
pp. 226-240
Author(s):  
Newbold
Keyword(s):  
Bay Of Bengal ◽  
Mineral Resources ◽  
Southern India ◽  
Southern Limit ◽  
Considerable Size

The diamond tracts of India lie between 13° and 25° N. lat; they occur in irregular arid patches, sometimes basin-shaped, in hilly districts on the great elevated plains bordering the more considerable rivers that have an easterly and southerly course to the Bay of Bengal. Diamonds of considerable size are not rarely found in the sands of these streams and of their tributaries; but their geognostic situs must be referred to the sandstone and sandstone conglomerate, which will be described at more length in the detailed accounts I am about to offer of the various localities in which this gem occurs, commencing with those of the Ceded Districts on the southern limit of the great diamond area just mentioned.

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