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The classical paper by Lighthill (Commun. Pure Appl. Maths, vol. 109, 1952, p. 118) on the propulsion of ciliated microorganisms has become the reference against which many modern studies on swimming in low Reynolds number are compared. However, Lighthill's study was limited to propulsion in a uniform flow, whereas several biologically relevant microorganisms experience non-uniform flows. Here we propose a benchmark for ciliary propulsion in paraboloidal flows. We first consider the axisymmetric problem, with the microorganisms on the centreline of the background flow, and derive exact analytical solutions for the flow field. Our results reveal flow features, swimming characteristics and performance metrics markedly different from those generated in a uniform flow. In particular, the background paraboloidal flow introduces a Stokes quadrupole singularity at the leading-order flow field, generating vortices. Moreover, we determine the necessary conditions on the strength of the background flow for optimal power dissipation and swimming efficiency. We then consider the more general case of a microorganism off the centreline of the background flow. In this case, the squirmer experiences a paraboloidal, linear shear and uniform flows due to its position relative to the flow's centreline. Our findings show that while the linear shear flow does not affect the translational and rotational velocities of the squirmer, it does influence the velocity field and, therefore, the power dissipation.
During World War II, Germany and the United States fought it out on the battlefields, but once the Allies were victorious, American attention quickly turned to the playing fields. Despite recent enmity, in the spirit of amity GIs quickly started recreational games with German youngsters. This seemingly natural development was at odds with both American expectations of the Germans and vice versa. Reeducation of Germany, and especially its Nazi-indoctrinated youth, was viewed as essential to peace, and the army, through sports, became perhaps unlikely early reeducators. This article outlines sports’ inherent Americanness, this impromptu playing, and its relationship to the formal army program of youth activities.
The petitioner sought a faculty for the exhumation of her mother's body from a consecrated burial ground, where she had recently been buried, in order to re-inter her in another consecrated burial ground, within the same diocese. The general rule enunciated by the Court of Arches in Re Blagdon Cemetery is that because of the theological principle that Christian burial is final, a faculty for exhumation will only be granted in exceptional circumstances. In this case, however, the petition was brought because of the proximity of the mother's grave to those of close family members of the petitioner's ex-husband, who had been violent and abusive towards her and her children over a period of some eight years. Neither the petitioner nor her children could visit her mother's grave because it caused them flashbacks, and the petitioner's GP confirmed that she was having nightmares and panic attacks and was suffering from anxiety and depression.
The Automatic Identification System (AIS) is extensively used in monitoring vessel traffic, and ship navigation related information can be obtained from the AIS data. However, AIS data contain extensive redundant information, which leads to the general need to compress the data when applying it in practice or conducting research. In this paper, a three-dimensional compression of ship trajectories using the Dynamic Programming algorithm has been proposed. The AIS data near the ports of Long Beach and San Francisco in the United States were used to test and compare the Dynamic Programming algorithm with the Top-down Time-ratio algorithms. The experimental results show that the proposed algorithm can better retain the position and time information at low compression ratio such as 1%, 20% and 40%. Moreover, the algorithm is applicable to ship trajectories with different motion modes such as steering, mooring and straight ahead. The results show that the proposed algorithm can reasonably solve the problem of AIS data redundancy and ensure the quality of data, which is of practical significance for water transport, transport planning and other related research.
Migration was common in medieval England. Serfdom, however, in theory severely restricted the mobility of villeins. This article explores servile migration through a close study of the manorial court rolls of the manors of Great Waltham and High Easter (Essex). By doing so, it contributes to ongoing debates over the nature and decline of serfdom in medieval England and over the role of towns as destinations for migration, which has been seen as contributing to the ‘Little Divergence’. Firstly, the article establishes the extent of servile migration as recorded in the manorial court rolls. In keeping with recent studies, almost half of recorded servile migrants stayed within ten miles of their home manor and, significantly, a sizeable majority (around two thirds) opted for rural destinations. The article then explores some dynamics of servile migration in detail. It suggests that enforcement of restrictions on the movement of villeins was attempted in the 1350s but that, in practice, the lord's coercive capacity was distinctly limited and ineffective.
The work reported in the Research Communication investigated in vitro rumen gas kinetics and fermentation profile as well as in vivo performance of lactating ewes fed corn silage (CS), sunflower silage (SFS) and their 50 : 50 mixture (CS-SFS). For the in vivo experiment, nine early-lactation Suffolk × Texel ewes were grouped in a replicated 3 × 3 Latin square design of three 21-d periods. Treatments were based on ad libitum CS, SFS, and CS-SFS supplemented with concentrate at 48 g/kg LW0.75. In vitro results showed that the CS had the highest dry matter degraded substrate and microbial crude protein production followed by CS-SFS. The in vivo data showed that animals fed on CS had higher digestibility of dry matter and organic matter than CS-SFS, while SFS were intermediate. Nitrogen (N) intake, fecal N excretion, and urine N excretion were similar between groups, however, milk N excretion was lower in SFS than CS. Milk yield was higher for CS and CS-SFS than SFS group, however, SFS-fed ewes had higher milk fat content than either CS or CS-SFS (all differences reported here were significant, P < 0.05 or better). Overall, CS-SFS could be used as dietary roughage for dairy ewes without deleterious effects on nutrient intake, N-balance and milk yield whilst potentially offering a more sustainable alternative to CS.
Three new species of thelotremoid lichens, Ampliotrema subglobosum Poengs. & Lumbsch, Ocellularia lichexanthonica Poengs. & Lumbsch and O. saxiprotocetrarica Poengs. & Lumbsch, are described and illustrated based on specimens from southern Thailand. Ampliotrema subglobosum is similar to A. globosum but differs by having larger ascospores with more septa. Ocellularia lichexanthonica differs from O. subdolichotata in ascomata diameter and by containing lichexanthone. Ocellularia saxiprotocetrarica is similar to O. gentingensis in ascospore length and the number of ascospore septa but has narrower ascospores and contains protocetraric acid. Fifteen species are reported for the first time for Thailand: Austrotrema bicinctulum (Nyl.) I. Medeiros et al., Baeomyces heteromorphus Nyl. ex C. Bab. & Mitt., Chapsa niveocarpa Mangold, Chiodecton sphaerale Ach., Erythrodecton malacum (Kremp.) G. Thor, Lecanora subjaponica L. Lü & H. Y. Wang, Leucodecton subcompunctum (Nyl.) Frisch, Myriotrema concretum (Fée) Hale, M. neoterebrans Frisch, Ocellularia khasiana (Patw. & Nagarkar) Kraichak et al., O. upretii S. Joshi et al., Pseudotopeliopsis scabiomarginata (Hale) Parnmen et al., Sulzbacheromyces sinensis (R. H. Petersen & M. Zang) Dong Liu & Li S. Wang, Thelotrema diplotrema Nyl., and T. isidiophorum (Kremp.) Zahlbr. Ampliotrema globosum (Hale) Poengs. & Lumbsch is proposed as a new combination. The genus Erythrodecton G. Thor is a new genus for the lichen flora of Thailand.
Studies of early mythography have stressed the dependent relationship between the so-called logographers and epic archaic poetry. Better knowledge of archaic and classical mythography in recent years has provided more accurate details of the context of the production and purposes of the fragmentary works by Hecataeus, Acusilaus, Pherecydes and Hellanicus. Each of them has his own agenda and programme, which have to be explained within their context and not, from a purely historic-literary perspective, as an appendix, a continuation or an exegesis of the epic tradition. This article argues that conditions of preservation, and means of transmission, of fragmentary mythographers have shaped the way we approach them. In other words, the process of reception of epic poetry through the exegetic and grammarian tradition distorts our view and leads the modern reader to see mythography as being dependent on Homer or Hesiod.
On August 19, 1953, Prime Minister Mohammed Mosaddeq was removed from office by a coalition of Iranians, including Mohammed Reza Shah Pahlavi (r. 1941–79) and members of the armed forces, supported by the United States and Great Britain. The US provided considerable financial, logistical, and organizational support to the coup, which was code-named Operation TPAJAX by the Central Intelligence Agency (CIA). Although the British had been committed, in one form or another, to removing Mosaddeq since he first became prime minister and nationalized Iran's British-owned oil industry in May 1951, the US did not determine to overthrow Mosaddeq by coup d'etat until spring 1953, shortly after the administration of President Dwight D. Eisenhower came to office.