scholarly journals Search for Structural Changes in the Cores of “Nearby” Radio Galaxies

1987 ◽  
Vol 124 ◽  
pp. 537-541 ◽  
Author(s):  
E. Preuss ◽  
W. Alef
Keyword(s):  
Flux Density ◽  
Structural Changes ◽  
Radio Galaxies ◽  
Apparent Velocity ◽  
North West ◽  
The Core ◽  
Characteristic Speed ◽  
The North ◽  
Vlbi Observations ◽  
Superluminal Motion

Recent VLBI observations of the central radio components in the lobe-dominated radio galaxies 3C111 (Götz et al. 1987) and 3C390.3 (Alef et al. 1987) show drastic changes in the structure of the compact emission regions. In 3C111 a jet-like feature with two knots and a flux density of 600 mJy which was visible in 1980.4 had disappeared in 1985.4. This implies “superluminal behaviour” with a characteristic speed of ≳ 3c. In 3C390.3, there is also evidence for superluminal motion: radio knots appear to be ejected from the core at a rate of about one every 4 years and move out with an apparent velocity of 4.1 c (Ho = 50 km/s/Mpc throughout this paper) in the direction of the north-west extended lobe.

scholarly journals 5 Years of VLBI and X-Ray Observations of NRAO 140

1988 ◽  
Vol 129 ◽  
pp. 35-36
Author(s):  
Alan P. Marscher
Keyword(s):  
Flux Density ◽  
Low Frequency ◽  
Total Flux ◽  
X Ray ◽  
The Core ◽  
Vlbi Observations ◽  
Superluminal Motion ◽  
Low Frequency Variability ◽  
Jet Structure

The author and his collaborators have observed NRAO 140 twice at X-ray energies and numerous times with multifrequency VLBI. The VLBI observations reveal a knotty jet structure with superluminal motion of the innermost two knots relative to the core. The VLBI core decreased by about a factor of 2 in flux density between 1980 and late 1984. The X-ray flux also declined by about the same factor during this period. Monitoring at 18 cm during periods of low-frequency variability has revealed pronounced changes in the relative brightnesses of the components of the source while the total flux density has varied by ≲ 10%.

scholarly journals Relativistic Jets in Low Power Radio Galaxies

1998 ◽  
Vol 164 ◽  
pp. 85-86 ◽  
Author(s):  
G. Giovannini ◽  
E. Arbizzani ◽  
L. Feretti ◽  
T. Venturi ◽  
W.D. Cotton ◽  
...  
Keyword(s):  
Low Power ◽  
Radio Galaxy ◽  
Morphological Changes ◽  
Radio Galaxies ◽  
Relativistic Jets ◽  
Radio Structure ◽  
The Core ◽  
Vlbi Observations ◽  
Relativistic Jet ◽  
Superluminal Motion

AbstractFrom VLBI observations of 11 FR I radio galaxies we find that: 1. parsec scale jets are relativistic; 2. 3C 264 shows a relativistic jet decelerating moving from the core to the extended lobes; 3. 3C 338 is a source with asymmetric parsec scale structure and morphological changes, implying proper motion on both sides of the source; 4. 1144+35 is an extended low power radio galaxy with an apparent superluminal motion in its parsec scale radio structure.

Property concepts in Tabaq: More than one road can lead to Rome

2020 ◽  
Vol 51 (1) ◽  
pp. 63-78
Author(s):  
Gertrud Schneider-Blum ◽  
Birgit Hellwig
Keyword(s):  
Small Class ◽  
North West ◽  
The Core ◽  
The North ◽  
Limited Role ◽  
Core Function ◽  
Word Classes ◽  
Semantic Types ◽  
Property Concepts

Abstract In this paper, we investigate the interplay between the morphosyntactic class of adjectives, the semantics of property concepts, and the function of noun modification in Tabaq, a Kordofan Nubian language (Nilo-Saharan phylum) spoken in the north-west of the Nuba Mountains in Sudan. Tabaq has a small class of adjectives containing few semantic types, and playing only a limited role with respect to the core function of adjectives: the modification of nouns. By contrast, a large number of descriptive modifiers is derived from two other word classes, verbs and nouns, and this paper describes the different ways of coding property concepts in Tabaq.

Amarna: Urban Manufacture of Luxury Items

2017 ◽  
Author(s):  
Anna K. Hodgkinson
Keyword(s):  
Far East ◽  
Ancient Egypt ◽  
Capital City ◽  
North West ◽  
Far North ◽  
The Core ◽  
The North ◽  
The Far East ◽  
Royal Road ◽  
The City

Little is necessary in terms of an introduction, since Amarna is one of the best-known settlements of ancient Egypt. The city was founded by pharaoh Amenhotep IV, known from his fifth regal year as Akhenaten, on his move away from Thebes and Memphis to found a new religious and administrative capital city. Akhenaten reigned approximately between 1348 and 1331 BC, and his principal wife was Nefertiti. Akhenaten’s direct successor appears to have been a figure named Smenkhare (or Ankhkheperure) who was married to Akhenaten’s daughter Meritaten. Like Nefertiti, Smenkhare/Ankhkheperure held the throne name Nefernefruaten. For this reason it is uncertain whether this individual was Nefertiti, who may have reigned for some years after the death of Akhenaten, possibly even with a brief co-regency, or whether this was a son or younger brother of the latter. The rule of Smenkhare/Ankhkheperure was short, and he or she was eventually succeeded by Tutankhamun. The core city of Amarna was erected on a relatively flat desert plain surrounded by cliffs on the east bank of the Nile, in Middle Egypt, approximately 60km south of the modern city of Minia, surrounded by the villages et- Till to the north and el-Hagg Qandil to the south. The site was defined by at least sixteen boundary stelae, three of which actually stand on the western bank, past the edge of the modern cultivation. In total, the city measures 12.5km north–south on the east bank between stelae X and J, and c.8.2km west–east between the projected line between stelae X and J and stela S to the far east, which also indicates approximately the longitude of the royal tomb. The distance between stelae J and F, to the far south-west, measures c.20km, and between stelae X and A, to the far north-west 19.2km. The core city, which is the part of the settlement examined in this section, was erected along the Nile, on the east bank, and it is defined by the ‘Royal Road’, a major thoroughfare running through the entire core city north–south.

scholarly journals The changing epidemiology of cryptosporidiosis in North West England

2005 ◽  
Vol 133 (5) ◽  
pp. 785-793 ◽  
Author(s):  
W. SOPWITH ◽  
K. OSBORN ◽  
R. CHALMERS ◽  
M. REGAN
Keyword(s):  
United Kingdom ◽  
Structural Changes ◽  
Health Benefit ◽  
Foot And Mouth Disease ◽  
Working Relationships ◽  
England And Wales ◽  
North West ◽  
The North ◽  
The United Kingdom ◽  
Genotype 2

Between 1996 and 2000, rates of cryptosporidiosis in North West England were significantly higher than overall in England and Wales, particularly during the first half of each year. In addition, during the second quarter of each year in this period, up to 40% of all cases recorded in England and Wales were from the North West Region. In 2001, cryptosporidiosis dramatically decreased throughout the United Kingdom and the springtime excess of cases formerly seen in the North West was no longer apparent. This changed epidemiology was due to a decline in cases of Cryptosporidium parvum (formerly genotype 2), associated with zoonotic transmission. Although the initial loss of a spring peak of infection corresponded with the outbreak of foot-and-mouth disease throughout the United Kingdom, its continued absence relates to major structural changes in the North West public water supply. This study highlights the far-reaching public health benefit of local working relationships in addressing re-occurring disease issues.

scholarly journals Superluminal Motion in the Parsec-Scale Jet of 3C 380

1998 ◽  
Vol 164 ◽  
pp. 77-78
Author(s):  
A.G. Polatidis ◽  
P.N. Wilkinson
Keyword(s):  
The Core ◽  
Vlbi Observations ◽  
Superluminal Motion

AbstractMulti-epoch VLBI observations of the quasar 3C 380 reveal a bent parsec-scale radio jet with complex substructure and superluminal motion out to ~100 pc from the core.

The armies of the Ṣaffārids

1968 ◽  
Vol 31 (3) ◽  
pp. 534-554 ◽  
Author(s):  
C. E. Bosworth
Keyword(s):  
Ninth Century ◽  
The South ◽  
The West ◽  
Islamic World ◽  
North West ◽  
The Third ◽  
The Core ◽  
The North ◽  
Frontier Region ◽  
Short Time

It is not too much to describe the Ṣaffārids of S‚stān as an archetypal military dynasty. In the later years of the third/ninth century, their empire covered the greater part of the non-Arab eastern Islamic world. In the west, Ya'qūb. al-Laith's army was only halted at Dair al-'Āqūl, 50 miles from Baghdad; in the north, Ya'qūb and his brother 'Arm campaigned in the Caspian coastlands against the local 'Alids, and 'Amr made serious attempts to extend his power into Khwārazm and Transoxania; in the east, the two brothers pushed forward the frontiers of the Dār al-Islām into the pagan borderlands of what are now eastern Afghanistan and the North-West Frontier region of West Pakistan; and in the south, Ṣaffārid authority was acknowledged even across the persion Gulf in ‘Umān. This impressive achievement was the work of two soldiers of genius, Ya'qūub and 'Amr, and lasted for little more than a quarter of a century. It began to crumble when in 287/900 the Sāmānid Amīr Ismā'īl b. Aḥmad defeated arid captured ‘Amr b. al-Laith, and 11 years later, the core of the empire, Sīstān itself, was in Sāmānid hands. Yet such was the effect in Sīstān of the Ṣaffārid brothers’ achievement, and the stimulus to local pride and feeling which resulted from it, that the Ṣaffārids returned to power there in a very short time. For several more centuries they endured and survived successive waves of invaders of Sīstān—the Ghaznavids, the Seljūqs, the Mongols—and persisted down to the establishment of the Ṣafavid state in Persia.

Legacies of Slavery in North-West Uganda: The Story of the ‘one-Elevens’

Africa ◽  
2006 ◽  
Vol 76 (2) ◽  
pp. 180-199 ◽  
Author(s):  
Mark Leopold
Keyword(s):  
Northern Uganda ◽  
East African ◽  
Southern Sudan ◽  
North West ◽  
The Core ◽  
The North ◽  
Rebel Groups ◽  
The Face ◽  
History Of ◽  
The One

AbstractThis article outlines the history of a people known as ‘Nubi’ or ‘Nubians’, northern Ugandan Muslims who were closely associated with Idi Amin's rule, and a group to which he himself belonged. They were supposed to be the descendants of former slave soldiers from southern Sudan, who in the late 1880s at the time of the Mahdi's Islamic uprising came into what is now Uganda under the command of a German officer named Emin Pasha. In reality, the identity became an elective one, open to Muslim males from the northern Uganda/southern Sudan borderlands, as well as descendants of the original soldiers. These soldiers, taken on by Frederick Lugard of the Imperial British East Africa Company, formed the core of the forces used to carve out much of Britain's East African Empire. From the days of Emin Pasha to those of Idi Amin, some Nubi men were identified by a marking of three vertical lines on the face – the ‘One-Elevens’. Although since Amin's overthrow many Muslims from the north of the country prefer to identify themselves as members of local Ugandan ethnic groups rather than as ‘Nubis’, aspects of Nubi identity live on among Ugandan rebel groups, as well as in cyberspace.

V.—Note on two Cephalopods Obtained by Lieut.-Col. Skinner, R.A.M.C., from the Valley of the Tochi River on the North-West Frontier of India

1904 ◽  
Vol 1 (10) ◽  
pp. 490-493
Author(s):  
G. C. Crick
Keyword(s):  
British Empire ◽  
Geological Survey ◽  
The West ◽  
Lower Eocene ◽  
North West ◽  
The Core ◽  
Fossil Remains ◽  
The North ◽  
North And South ◽  
Upper Mesozoic

The valley of the Tochi River is an outlying corner of the British Empire in India forming a portion of Waziristan, the boundary of which was delineated in 1894–5 by an Anglo-Afghan Commission from the Afghan provinces of Khost on the north and Birmul on the west. Mr. F. H. Smith, of the Geological Survey of India, accompanied this Commission as geologist, and his observations “On the Geology of the Tochi Valley” were published in 1895 in the “Records of the Geological Survey of India” (vol. xxxviii, pt. 3, pp. 106–110, pl. iii). On p. 109 he says:—“The range of hills between Idak and Mirán Shah is formed by an anticlinal ridge which approximately strikes north and south, and which is composed of these lower eocene beds. In the core of the anticlinal a considerable thickness of massive dark grey limestone is exposed, in which I could find no fossil remains; the age of this limestone is therefore doubtful, and there is no evidence of any kind to show whether it belongs to the lowest tertiary or upper mesozoic age.”

scholarly journals BL Lacertae's Compact Variations, 1980–86: A Polarized, Superluminal Challenge

1988 ◽  
Vol 129 ◽  
pp. 103-104
Author(s):  
Robert B. Phillips ◽  
Robert L. Mutel
Keyword(s):  
Flux Density ◽  
Optical Depth ◽  
Time Scale ◽  
Real Component ◽  
Vlbi Observations ◽  
Superluminal Motion ◽  
Bl Lac

BL Lac shows tightly correlated events in flux density and polarization. When the time scale slows enough for VLBI observations to track them, moving features which mimic piston-driven shocks seem to carry the disturbances. Evidence for BL Lac's shocks may ameliorate the difficulties posed by the excessive incidence of superluminal motion among core objects; superluminal motion may arise from any number of conditions combining shocks and optical depth, not just real jet or real component motions.

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