Silver Rings Research Articles

Tarnish tattoos - localised cutaneous argyria from sterling silver in fresh piercings: a case series.

Tarnish tattoo is a form of localised cutaneous argyria resulting from the deposition of silver into the skin following exposure to silver jewellery in fresh piercings. This report presents the clinical presentation, diagnosis, and management of 4 female patients with tarnish tattoos on the nose and ear from wearing silver jewellery. All four patients wore silver studs or rings immediately following the piercing. Two of the four patients underwent treatment with nanosecond Q-switched 1064nm Neodymium: Yttrium Garnet laser (QS Nd: YAG) and Q-switched Alexandrite 755nm lasers with minimal improvement. Tarnish tattoos are an under-recognized side-effect of wearing silver jewellery in fresh piercings. The grey-blue discolouration from tarnish tattoos can be challenging to treat with nanosecond QS lasers.

Large focal length planar focusing of Dyakonov polaritons in hyperbolic metamaterial

Achieving subwavelength optical focusing is of great importance in nanophotonics. However, achieving focusing with both a small focal spot size and a large focal length remains elusive so far. Here, a large focal length planar focusing device is presented, utilizing highly oriented Dyakonov polaritons in hyperbolic metamaterial with periodic silver rings as the excitation source. Experimental results show that by controlling the size of the excitation sources, the focal length can reach 6λ0 (where λ0 is the illumination wavelength), and the focal spot size can be reduced to λ0/10. This method provides new prospects for planar polariton optical applications.

Adornment deposits: a study of bead and jewellery remains from Late Antiquity tombs in the Red Sea port of Berenike

ABSTRACT Next to pottery, items of adornment comprise the most abundant material excavated in Northeast Africa, often being the only evidence for long-distance interactions. Interdisciplinary research has been developed to demonstrate that beads, particularly those of Indian origin from port sites on the Red Sea coast of Egypt, may attest to intense relations between North Africa and Asia. Parallels and provenance examination of recent bead and jewellery finds (four silver and coral earrings, eight silver rings and about eleven ivory bangles) from two Late Antiquity tombs of the fourth/fifth centuries AD at Berenike also suggest links between the Red Sea coast and the Nubian Nile Valley. Additionally, these ornaments raise questions as to their function in multiple burials. It is not possible to determine whether they were used as part of the funerary ritual or as offerings to the individuals buried, but several observations can be offered.

Diety Nike-Victoria of the late Antique period on the territory of Georgia

The states on the territory of Georgia were part of the Classical antiquity ecumene. Accordingly, both Iberia and Colchis had close trade-economic and cultural relations with the Roman Empire, from where the deities popular in the empire spread to the territory of Georgia. Among them, a special place is occupied by the ancient god of victory, Nike (Ancient Greek: Νίκη). The name Nike is believed to date back to the pre- Greek period. In Greek mythology, Nike appears as a companion of Zeus and Athena. In Greek art, the deity is mainly depicted with symbols of victory – wings, a crown and a palm branch, but we also find a wingless Nike. In Roman reality, the Victoria (Latin: Victoria) corresponded to Nike. Research has shown that the deity Nike (Victoria) was one of the most widespread cults in late ancient Iberia, which is the result of political and cultural relations with the Greco-Roman world. In late antiquity, the cult of Nike (Victoria) was recorded on the territory of Georgia in the Kingdom of Kartli (Iberia) – on the territory of Greater Mtskheta, Urbnisi, Zhinvali... Since the Hellenistic period, religious syncretism was also reflected on the engraved gems found on the territory of Kartli. Athena-Tikhe-Fortuna- Demeter-Nike depicted in an oval-shaped cornelian intaglio in a fragment of an iron ring. Tomb №27 of Karniskhevi, 2nd-3rd centuries. Nike-Fortuna-Athena is depicted in an oval-shaped white, transparent glass intaglio in an iron seal. Urbnisi necropolis. Tomb №205. 1st-early 2nd century AD. Seals with the image of the deity Nike (Victoria) found in the territory of Georgia belonged to all layers of society. Gemas can be found both individually and in gold, silver and bronze rings. Intaglios with the image of the deity are made of: carnelian, glas, almadine, which are inserted into iron, bronze, silver and gold rings. It is noteworthy that the cult of Nike (Victoria) is mainly prevalent in urban centers. From the above, we can conclude that Nike (Victoria) was popular and in our opinion, mainly among the Romanized population.

Bioinspired Nanomaterial Synthesis and Applications in Catalysis

We will discuss the use of a tobacco mosaic virus coat protein (TMVCP) as a versatile platform to synthesize a series of metallic nanomaterials and their applications in energy related electrocatalytic reactions. Taking advantage of the self-assembly properties of TMVCP under different solution conditions, nanoparticles can be embedded onto the disk protein surface or capped by protein subunits. We show that in addition to the eco-friendly synthesis merit, the as prepared materials are superior catalysts in electrocatalytic reactions. While the nanosized silver rings exhibit significant enhancement towards catalysing electrochemical carbon dioxide reduction reaction, the TMVCP-templated two platinum catalyst are promising candidates for methanol oxidation reaction. Besides electrocatalysis, potential applications of protein-metal hybrid systems in heterogeneous organic synthesis are also described. Gold and palladium nanoparticles capped by the bulky protein subunits are employed for two organic reactions and also showed remarkable kinetics.

Coordination-Driven Self-Assembly of Silver(I) and Gold(I) Rings: Synthesis, Characterization, and Photophysical Studies.

In this work, we investigate the self-assembly between Ag(I) and Au(I) centers and pyridyl donors to form hexagonal metallacycles and related linear complexes. The precipitation of hexagonal metallacycles upon assembly in chloroform/methanol mixtures results in high solid-state photo-stability. Whereas, the Ag(I) species have fast kinetics and high formation constants in acetone, this solvent interferes in the formation of the analogous Au(I) complexes. The photophysical properties of this suite of metallacycles was investigated including steady-state absorption, emission, and time-resolved lifetime measurements. All ligands and hexagons exhibited ligand-centered singlet emissions with ground-state absorption and emission perturbed upon coordination. The ligand-based fluorescent photoluminescence was affected by the heavy-atom effect when halide or metals are present, attenuating quantum yields as evidenced by increases in the experimentally measured non-radiative rate constants. The formation of group 11 metallacycles is motivated by their potential applications in mixed-matrix materials wherein metal ions can interact with substrate to facilitate separations chemistry with reduced energy requirements, in particular the isolation of ethylene and light olefins. Existing processes involve cryogenic distillation, an energy intensive and inefficient method.

Archaeometallurgical studies on corrosion behaviour of Cu-As alloys from "Lama" (2nd millennium BC), Iran

The Lama cemetery is located in west of the Zagros Mountains in Iran. The excavated materials are bronze objects, silver rings, iron items and pottery that were scattered in the graves. Pottery with continuous painted lines and triangular patterns and metal tools were the main evidence for dating the cemetery to the Middle Elamite II, III and Neo-Elamite I periods (1400-800 B.C). The objects were analyzed by means of ICP-OES, OM and SEM-EDX in order to obtain data on the metal composition and alloying process. The results show various compositions concerning the Cu/Sn ratio in the metallic core of the objects. The variety of tin content proves that the objects were not made by using a particular proportion of alloying elements. An uncontrolled process was used to produce tin bronze, such as co-smelting, cementation, recycling or smelting copper- tin bearing ores.

Roman Gems in the National Soares dos Reis Museum in Oporto

The 34 intaglios and cameos discussed in this paper are part of a collection of 136 gems (both Roman and Modern) we studied in 2002, with permission of the former Museum director, Mónica Baldaque, and the curator Fátima Macedo. Some of those gems are set in rings (no. 10 – Roman iron ring; no. 22 – medieval gold ring; no. 31 – modern gold ring; also 3 ceramic cameos depicting the Portuguese Queen Maria I – modern silver rings: inv. nos 74 CMP; 75 CMP and 174 MNSR) and 2 others in snuff boxes (1 ivory cameo and 1 Wedgwood cameo – inv. nos 37 MNSR and 31 MNSR, respectively). Besides them, the museum also holds a collection of 800 plaster seals. Among the types of these Roman gems, some deserve special attention: Marsyas (no. 6) – the only gem in the Portuguese Gem Corpus bearing this theme, as well as those of Athena Promachos (no. 7), Isis-Selene bust (no. 9), Socrates (no. 11), Diogenes (no. 14), eagle fighting a serpent (no. 17), shrimp and murex (no. 19), mouse (23) and confronted doves (no. 25). This last one, with its associated inscription, perhaps symbolizes the union of a couple by the bonds of matrimony. However, how did the scarab bearing a Centaur (no. 28) reach Portugal?

TMV Disk Scaffolds for Making sub-30 nm Silver Nanorings.

Nanosized bioscaffolds can be utilized to tackle the challenge of size reduction of metallic rings owing to their miniature features as well as their well-known biomineralization capacity. The tobacco mosaic virus coat protein is used as a command surface to grow and assemble silver nanoparticles into sub-30 nm rings. The versatility of TMV allows the formation of both solid silver rings and rings consisting of discrete silver nanoparticles. The pH-dependent coulombic surface map along with the annular geometry of the protein aggregate allow the generation of rings with or without a central nanoparticle. Our silver rings are believed to be the smallest to date, and they can offer a test material for existing theories on metallic nanorings of this heretofore unreached size scale.

Polarization Characteristics of High-Birefringence Photonic Crystal Fiber Selectively Coated with Silver Layers

The polarization characteristics of high-birefringence photonic crystal fiber (HB-PCF) selectively coated with silver layers are numerically investigated using the full-vector finite element method (FEM). The fundamental mode coupling properties and polarization splitting effect are discussed in detail. Results show that the resonance wavelength, resonance strength, and splitting distance between two polarized modes can be adjusted significantly by changing the fiber structure, the diameter of silver rings, and the thickness of silver layers. A single-polarization filter at 1310 nm bands is proposed with the corresponding loss 500 dB/cm and full width half maximum (FWHM) only 23 nm. This work is very helpful for further studies in polarization-dependent wavelength-selective applications or other fiber-based plasmonic devices.

Unidirectional reflectionless propagation in a non-ideal parity-time metasurface based on far field coupling.

We propose a scheme to achieve a controllable unidirectional reflectionless propagation at exceptional point (EP) in a non-ideal parity-time metasurface consisting of two silver ring resonators. The unidirectional reflectionless propagation can be manipulated by simply adjusting the angle of incident wave and the distance s between two silver rings based on the far field coupling. In addition, the angle of incident wave in a wide range of ∼25° is available to achieve the unidirectional reflectionless propagation. Moreover, the unidirectional reflectionless propagation at EP is insensitive to the polarization of incident wave due to the two-ring structure.

Nanoring formation via in situ photoreduction of silver on a virus scaffold

The fabrication of plasmonic nanorings remains of substantial interest by virtue of their enhanced electric and magnetic response to light fields which can be subsequently exploited in diverse applications. Scaling down the size of nanorings holds promise in creating artificial magnetism at wavelengths matching the solar spectrum. Nanosized bioscaffolds can be utilized to tackle the challenge of size reduction of metallic rings owing to their miniature features as well as their well-known biomineralization capacity. Herein, we use the tobacco mosaic virus coat protein as a command surface to grow and assemble silver nanoparticles into sub-30 nm rings. The versatility of TMV allows the formation of both solid rings and rings consisting of discrete nanoparticles that are characterized by UV–vis and TEM. The pH-dependent coulombic surface map along with the annular geometry of the protein aggregate allow the generation of rings with or without a central nanoparticle. Our silver rings are believed to be the smallest to date, and they can offer a test material for existing theories on metallic nanorings of this heretofore unreached size scale.

FROM THE ANTIMATTER FACTORY

3 7 R F R O M T H E A N T I M A T T E R F A C T O R Y G W Y N E T H L E W I S Which shall I choose? A ring of ‘‘layered time’’? Or ‘‘corset, its strings undone’’? Sexy, but. ‘‘Dark pearl in a storm’’? No, earrings: two isinglass panes Held in three silver rings, hooks cool In my flesh for now. The mica Glitters, pleasingly subtle For your ocular pleasure; Me, I love, when I turn my face Towards you, that tug of inertia, The feel of cold pendulum kisses Against my neck, as mass longs for matter. The quotations come from www.antihydrogen.com, featuring jewelry by CERN antimatter physicist Dr. Michael Doser. This poem and the two following were commissioned by CERN. ...

An aerosol-based soft lithography to fabricate nanoscale silver dots and rings for spectroscopic applications.

Site-selective deposition of aerosol Pd nanoparticles on a substrate was employed to fabricate nanoscale Ag dots and rings through a subsequent electroless deposition. The fabricated nanoscale dot and ring arrays respectively showed properties in surface-enhanced Raman (SER, with a 1.8 × 10(5) enhancement factor) and Fourier transform near infrared (FT-NIR, at 6153 cm(-1) absorption band) spectra.

Son of No. One

Thanks, thanks, the lady says. Yeah.A guy last week had sold her headache pills for $50 and she'd lost faith in the system, the midnight beat train and the stranger danger, a safety fire. I told her it was fine, I'd made it myself.Made it yourself?She didn't believe me. I said Sure, still in school and I can't get a job and this is all I could come up with.Funny boy, she said, and she'd taken my real stufffor real money. Funny boy. Like mama does say.I was far from land and I saw in the sky my dog's nose poking out of an old blanket that used to be mine. They'd started to put the signs up in the pharmacies around where I lived:No Pseudoephedrine Sold Here.Then there were the reasons why underneath in little letters, all the guys and some girls but mostly guys like me sick every day taking their tablets home to pestle and mortars and later bathtubs and Bunsen burners. I have to travel so I can stay in one place. Out here no one cares and I'm fifth in line when I'm used to being first, but I've never won anything. Rattails and yoga pants pushing little bags of garbage.Someone says, Hurry the fuck up. Someone else turns around and says, Shut the fuck up.I've never won anything but I just want to break even.Do you want this life?Do you want it?There's this girl, pre-drinking and doing her makeup on the train back from Pakenham. City bound and her legs shine in the carriage; she's got a handbag like a fancy cushion and a big heel and some toes kicking up and down. She doesn't want what I've got because it's not ready yet and, she told me, I aren't got a cold, and she laughed and rubbed her dry lips on top of each other and forgot I was sitting there watching those legs and moving around in my seat. Sugar waftlike babydoll pink in here, like a crying flower in here, just me and her.Her lips are wet now and so are her eyes. She looks in a small mirror too much at herself. The old teen weeps I-just-want-love all over the slashed leather seats and rude walls. I fucked ya mum to the leftand a good-time phone number on the right.I get offkays from my stop and following the tracks home gives me a new perspective.I put the good-time number I saw on the wall in the train in my other phone and wait on the dial tone.Hey, says a girl. This is Chelsea.Why they call her Chelsea when her name's Davina, I asked a guy who knew her one time.Got a smile like razors made it, he told me.She did. I liked Chelsea but I didn't want to fuck her.Don't know my dad, she says, our breath smelling like the same cigarette. Don't know.Me neither, I tell her. Some guy.Some guy, she breathes out, taking the cigarette. Hey you and me, we could have the same dad.Chelsea laughs and Chelsea is like that. Her tongue whistles over her teeth set like broken porcelain into her gums and over her barbed lips. She is pretty when she pretends she's not Chelsea, who is not Chelsea but a girl called Davina.I fucked up ma's life, she's saying. Ma was gonna go to school. Couldn't get rid of me but wanted to, she says. Tells me that some nights so I go someplace else. Monya's or Cassandra's. Sometimes Monya is at Cassandra's.Chelsea makes a tent over her nose and the back of my hand and smells those poison roses I grow.Thanks, she sniffs and the taste of those flowers is bad, Yeah thanks. Why are you here?Just am.Some guy. Chelsea nods and she knows that story, and there are pinpricks in her eyes and she shakes her head; it flops over the back offthe bench. Her hair trails in the autumn water. Thanks, she keeps saying. Comes back up and squints and complains, My tram is here.She gets on and swings from the third step, her fingers and their thin silver rings poking out of her sleeve. Looks back at me. She paints her nails with White-Out.Are you just some guy, she says, she doesn't ask. …

은제품의 황화은 부식층 제거를 위한 Nd:YAG 레이저클리닝 실험 연구

ABSTRACT Silver objects tarnish with black from reaction with sulfurous acid or hydrogen sulfide of atmospheric. Blackening of silver objects results from formation of silver sulfide(Ag 2 O) on the surface. Silver sulfide usually is usually removed by conservation treatment. There are several cleaning methods such as chemical, electrochemical and micro-abrasion cleaning, but all of them consume silver. This study investigated the safe and effective parameter of laser cleaning by test on silver coupons. Laser cleaning is a selective process for the removal of specific substances. At first, laser cleaning appli ed to plain silver coupons, which were not corroded, to find out th e safe range of laser energy de nsity. From results, plain silve r coupons were not changed at 1064nm below 4.00J/cm 2 and at 532nm below 2.39J/cm 2 . The corrosion layer(silver sulfide) of artifical corroded silver coupons was removed at 1064nm with 2.39J/cm 2 by 5~10 pulses and at 532nm with 1.19J/cm 2 by 5~10 pulses. The removal thickness of co rrosion layer was about 13-25nm per a lase r pulse using AES analysis. In addition, laser cleaning tested the tarnish silver rings based on the results of silver coupons. As a result of test, the black surface w ere clean successfully and gave luster of silver, which showed the application possibility of laser cleaning for silver objects.Key Words: laser cleaning, silver objects, silver sulfide, Nd:YAG laser, Auger Electron Spectroscopy(AES)

Polarization-independent electromagnetically induced transparency-like effects in stacked metamaterials based on Fabry–Pérot resonance

We propose a scheme for realizing plasmonic electromagnetically induced transparency (EIT)-like effects at optical frequencies in a stacked metamaterial that consists of two silver rings. The two silver rings are excited strongly by an incident wave. Based on Fabry–Pérot (FP) resonance coupling between the two resonators, polarization-independent EIT-like effects appear at optical frequencies.

Clinical Feasibility of Soft-Tissue Matching in Cone-Beam Computed Tomography (CBCT) Guidance for Liver Cancer Patients

The feasibility of soft-tissue matching in cone-beam computed tomography (CBCT) guidance for liver cancer patients is investigated and its equivalence to fiducial-marker matching on determining patient setup corrections has been studied. On the Elekta Synergy machine, daily CBCT volumetric images were acquired after setup with silver rings (SRs) in liver. The SRs were served as fiducial markers in our study. The CBCT images without SRs in liver were then obtained by digitally removing the SRs in each projection image using photoshop CS4.Considering fiducial-marker matching as a standard, the patient setup errors were compared between two two matching methods. A total of 90 datasets of volumetric images for 10 patients were used in the comparison. Pearson coefficient of correlation for the setup errors was as follows: R2 = 0.718, 0.724, 0.785 in the LR, AP and SI directions, respectively. A Bland-Altman analysis showed no significant trends. The percentage of errors within a ±3 mm tolerance was respectively 95.56%, 95.83%, 91.11%. The p-value (paired permutation test) are respectively 0.1217, 0.919 and 0.7685 in the three cardinal directions and are all greater than 0.05. So, the null hypothesis cannot be refused, that is to say. Two methods have no significant difference. CBCT guidance using soft-tissue is an equivalent method for on-line image-guided radiotherapy for liver-cancer patients when compared to CBCT guidance using fiducial markers. It is feasible to implement CBCT image guidance using soft-tissue matching method clinically.

Searching for thermal signatures of persistent currents in normal-metal rings

We introduce a calorimetric approach to probe persistent currents in normal metal rings. The heat capacity of a large ensemble of silver rings is measured by nanocalorimetry under a varying magnetic field at different temperatures (60 mK, 100 mK and 150 mK). Periodic oscillations versus magnetic field are detected in the phase signal of the temperature oscillations, though not in the amplitude (both of them directly linked to the heat capacity). The period of these oscillations ($\Phi_0/2$, with $\Phi_0 = h/e$ the magnetic flux quantum) and their evolution with temperature are in agreement with theoretical predictions. In contrast, the amplitude of the corresponding heat capacity oscillations (several $k_{\mathrm{B}}$) is two orders of magnitude larger than predicted by theory.

Planar SERS nanostructures with stochastic silver ring morphology for biosensor chips

Surface-enhanced Raman spectroscopy (SERS) of living cells has rapidly become a powerful trend in biomedical diagnostics. It is a common belief that highly ordered, artificially engineered substrates are the best future decision in this field. This paper, however, describes an alternative successful solution, a new effortless chemical approach to the design of nanostructured silver and heterometallic continuous coatings with a stochastic “coffee ring” morphology. The coatings are formed from an ultrasonic mist of aqueous diamminesilver hydroxide, free of reducing agents and nonvolatile pollutants, under mild conditions, at about 200–270 °C in air. They consist of 30–100 micrometer wide and 100–400 nm high silver rings composed, in turn, of a porous silver matrix with 10–50 nm silver grains decorating the sponge. This hierarchic structure originates from ultrasonic droplet evaporation, contact-line motion, silver(I) oxide decomposition and evolution of a growing ensemble of silver rings. The fabricated substrates are a remarkable example of a new scalable and low cost material suitable for SERS analyses of living cells. They evoke no hemolysis and reduce erythrocyte lateral mobility due to suitable “coffee ring” sizes and a tight contact with the silver nanostructure. A high SERS enhancement, characteristic of pure silver rings, made it possible to record Raman scattering spectra from submembrane hemoglobin in its natural cellular environment inside single living erythrocytes, thus making the substrates promising for various biosensor chips.