Monthly Archives: October 2016
Original Article: By ANNALEE NEWITZ arstechnica.com A glimpse of the last people on Earth to colonize a continent without humans. For more than a decade, evidence has been pili…
Under beams of X-rays, the colours of art become the colours of chemistry. The mysterious blacks, reds and whites of ancient Greek pottery can be read in elements – iron, potassium , calcium and zinc – and art history may be rewritten.
Image on Greek vase.( Image) https://2.bp.blogspot,com
Image: https:// 1.bp BlogSpot.com
Stanford’s Cantor Arts Center worked with SLAC scientists to explore the chemistry hidden under the paintings on this Greek flask.The chemical map image shows calcium(green) matching the white areas in the driver’s tunic and dot accents, and iron (red) and potassium (blue) matching the black of the horse and figure silhouettes. (Credit : SLAC National Accelerator Laboratory)
That’s the power of a growing collaboration between the Cantor Arts Center’s Art and Science Learning Lab, art and science faculty, and the Stanford Synchrotron Radiation Light source (SSRL) at SLAC National Accelerator Laboratory.
Having a faculty like SSRL just up the hill from the Cantor’s conservation lab lends a unique opportunity for students to probe cultural mysteries with advanced scientific tools, say Susan Roberts- Manganelli,director of the Learning Lab. About two years ago she started a fellowship for science students interested in studying art conservation. She works closely with SSRL scientific staff to mentor students bringing delicate, valuable art objects to SLAC in search of discoveries that benefit art and science
A chemical map of Greek art revealed that a calcium-based colour additive was used for white, which would have added an additional step .It also raised questions about the firing process due to the absence of zinc in the black regions. It had been assumed that a zinc additive was key to achieving the black figures in the heating process.(Credit SLAC National Accelerator Laboratory)
“We can do a lot of testing here at the Cantor,” Roberts Manganelli says, “But some studies need more robust collaboration and more powerful X-rays to actually get answers to our questions.” One such study, done by Kevin Chow, BS’ 13, when he was a senior in collaboration with Stanford, SLAC and the Getty Conservation Institute, took a deeper look at the techniques of the ancient Greek potters, which are difficult to reproduce and not entirely understood. Using a technique called synchrotron X-ray fluorescence, the team was able to uncover surprising steps in the production process that challenge the conventional understanding.
Athenian oil-flask ( Lekythos) from 500-480 BC; decorated in the black-figure technique (Credit SLAC National Accelerator Laboratory)
“Under what they thought was a single coat, they found other instances of painting that the naked eye could not see,” says Chow’s advisor Jody Maxim, associate professor of art and art history and of classics. “It was thrilling to learn that a very humble vase – hundreds of these were produced for the Festival of Athena every four years – shows certain standards of aesthetic excellence. The artists invested more in his work than we had given him credit for.”
Such collaboration spark scientific innovation as well. Well conserved art objects allow researchers to look at uniquely complex materials of a certain age that generate intriguing chemistry questions and require new techniques, says SLAC staff scientist Apurva Mechta, who is also an affiliated faculty member at the Stanford Archaeology Center. ” We had to find a way to see all layers of the Greek pot in detail, which is something we want to do for other materials that might be used in batteries or electronics.”
A custom-made mount held the delicate pot during a rotational scan at SSRL
(Credit SLAC National Accelerator Laboratory)
Source: SLAC National Accelerator Laboratory)
Koko, our rescue dog has now been with us for almost a year. When we first adopted him we thought we were going to lose him as he became ill shortly after. We took him to the Vetinary Surgeon and explained that Koko was behaving very strange and seemed to have lost his spirit. He was shying away from us and everyone else, He would hide around any corner and did not want to be fussed or stroked when previously he loved seeing people and wanted them to play with him. His character had changed completely and now he was not eating or drinking. We were very worried.
Marianella – the Vet, proceeded to give Koko a thorough examination which he did not object to at all .She checked his blood pressure, his pulse, his ears eyes and throat and could not find any problems. She then took a blood sample which revealed that he had been bitten by the sand fly which is quite serious and requires medical treatment.. This treatment involved a course of injections which were pretty horrendous because it was not only one but three injections, the last one Marionella said is going to hurt him, it has to be injected into his neck. Well it sure did because he let out one big squeal which frightened everyone else in the surgery. Poor Koko The sand fly causes a disease which can only be kept under control, so Koko has to have 2 tablets per day for the rest of his life.
Waiting for my dinner.
Koko’s play time.
Koko here with me in my study room.
Koko receiving his early morning greeting from our neighbor.
He is now fit and well and back to his lovable lively self , bounding up to people who of course are spoiling him. We have to take him every three months to see Marionella for her to keep a close eye on him, and of course, he gets spoilt there also. At one stage she thought we were going to lose him but thanks to her she saved his life.
CREDIT: KENNETH BARNETT TANKERSLEY Despite long-held assumptions, UC researchers find the diversity of salts in water and soil beneficial — not harmful — for cultivating m…
Measurement of 17 conjectural units total of dry and liquid volume & weight in Minoan Linear A: Each entry below is classified by UNIT of measurement + amount + tablet + measurement type (dry o…
THIS IS ALL MY TEACHERS WORK WHICH I FIND FASCINATING BECAUSE UNLIKE LINEAR B. LINEAR A HAS NOT YET BEEN FULLY DECIPHERED.