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Search Results: 1 - 10 of 228201 matches for " R. Williams "
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Reply to - "On the Discovery of a Polarity-Dependent Memory Switch and/or Memristor (Memory Resistor)"
Williams R
IETE Technical Review , 2010,
Bethe–Salpeter studies of mesons beyond rainbow-ladder
Williams R.
EPJ Web of Conferences , 2010, DOI: 10.1051/epjconf/20100303005
Abstract: We investigate the masses of light mesons from a coupled system of Dyson–Schwinger and Bethe– Salpeter equations. We explicitly take into account dominant non-Abelian and sub-leading Abelian contributions to the dressed quark-gluon vertex. We also include unquenching e ects in the form of hadronic resonance contributions via the back-reaction of pions. We construct the corresponding Bethe–Salpeter kernel that satis es the axial-vector Ward-Takahashi identity. Our numerical treatment fully includes all momentum dependencies with all equations solved completely in the complex plane. This approach goes well beyond the rainbow-ladder approximation and permits us to investigate the relative impact of di erent corrections beyond rainbow-ladder on the properties of mesons. We nd that sub-leading Abelian corrections are further dynamically suppressed, and that our results supersede early qualitative predictions with signi cantly simpler truncation schemes.
Metals, Metalloids and Toxicity in Date Palms: Potential Environmental Impact  [PDF]
John R. Williams, Avin E. Pillay
Journal of Environmental Protection (JEP) , 2011, DOI: 10.4236/jep.2011.25068
Abstract: This paper summarizes our studies on metal and metalloid uptake by the date palm, Phoenix dactylifera L., a tree of considerable importance in arid regions. The typical concentrations of 17 elements in the date palm are summarized and compared with existing data in the scientific literature. The role and toxicity of these elements are considered. Issues encountered by us during sample collection, pre-treatment and chemical analysis are described. Future studies are suggested.
Heavy Metals and the Alternate Bearing Effect in the Date Palm (Phoenix dactylifera)  [PDF]
John R. Williams, Avin E. Pillay
Journal of Environmental Protection (JEP) , 2015, DOI: 10.4236/jep.2015.69088
Abstract: The alternate bearing effect is when plants produce abundant crops of fruit in some years, but sparse yields in others. This review summarises recent studies that suggest a connection between the alternate bearing effect in the date palm, Phoenix dactylifera, and the presence of certain chemical elements (mostly metals) in the tree tissues. So far, there is evidence that levels of Ag, B, Ba, Ca, Cd, Cu, Fe, K, La, Mg, Mn, N, Na, Se, Tl, and Zn in the dates and leaflets are affected by the alternate bearing phenomenon. The significance of this work, therefore, emphasises the prospect of using our experimental data to overcome sparse yields, due to the alternate bearing effect, and producing more prolific growth of fruits. The potential agricultural, economic, environmental and health implications of these findings are considered.
Ionization Front Instabilities
R. J. R. Williams
Revista mexicana de astronomía y astrofísica , 2003,
Short Communication: Some Observations on the Role of Bradykinin in Immunity to Teladorsagia circumcincta in Sheep
Andrew R. Williams
Journal of Parasitology Research , 2012, DOI: 10.1155/2012/569287
Abstract: Bradykinin is a physiologically active peptide involved in vasodilation and smooth muscle contraction and is previously shown to be increased in gastrointestinal mucus during nematode challenge in sheep. Here, it is shown that bradykinin in the abomasum is positively correlated with both mast cells and globule leukocytes in the abomasum, and that all three of these parameters are negatively associated with numbers of adult Teladorsagia circumcincta during the challenge of immune sheep. It is suggested that bradykinin either stimulates the degranulation of mast cells, or is released during this degranulation process, or both. Multiple regression showed that almost 60% of the variation of in adult T. circumcincta could be explained by two variables, bradykinin and T. circumcincta—specific IgG1 in plasma. This provides further evidence that bradykinin may be a mechanism of protective immunity in sheep, although its involvement in asthma and other allergic disorders raises questions about its role in unwanted immunopathology.
The gilding of armour
A. R. Williams
Gold Bulletin , 1977, DOI: 10.1007/BF03215444
Abstract: Body armour during the middle ages and later was made of iron or steel plates, and for wealthy customers would be tailor-made and decorated by gilding. This article describes an investigation of the gilding methods employed.
Metals, Health and the Environment ¢ € “ Emergence of Correlations Between Speciation and Effects
David R. Williams
Bioinorganic Chemistry and Applications , 2003, DOI: 10.1155/s1565363304000196
The Manufacture of Mail in Medieval Europe: A technical note
Williams, Alan R.
Gladius , 1980, DOI: 10.3989/gladius.1980.135
Abstract: THE oldest specimen of interlinked mail yet found has been excavated from a 3rd cent. B. C. Celtic grave in Romania, and this was probably developed from protective garments made up of rings threaded onto cords, like netting. A fragment of such a garment has been found in a Hallstatt grave, perhaps of the 8th cent. B. C. in Bohemia. Representations of Roman soldiers prior to the 1st cent. A. D. show them clad in mail-shirts rather than in plate. Mail returned to favour in the straitened economic circumstances of the Migration Period. and. indeed. remained the basis of most personal armour in the Middle Ages until gradually replaced by plate again in the 15th cent. No disponible.
Seven swords of the Renaissance from an analytical point of view
Williams, A. R.
Gladius , 1978, DOI: 10.3989/gladius.1978.141
Abstract: IN an earlier paper in Gladius, I discussed methods of producing hardened steel sword blades in the Middle Ages; most of the specimens illustrated came from the period 1000-1500 A. D. Comparatively little has been written about Greek and Roman sword blades but a good deal about the pattern-welding of those blades which succeeded them in Western Europe. This was a method (practised between the 3rd and 10th centuries A. D.) of making large sword blades out of numerous small pieces of iron, producing, in addition, a decorative effect which was much prized, at least as much as any improvement in hardness. With the revival of the employment of large shaft furnaces, larger pieces of iron could be made, and pattern-welded blades went out of use around the l0th/11th century. Many blades of the Middle Ages were simply made by forging out a single bar of iron, edge-carburising it and then hardening the steeled edge by some form of heat-treatment, of which an example is specimen. No. 1. Other blades were made by forging together layers of steel and iron to give a steel cutting-edge (on a softer core) which could then be hardened. No disponible.
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