Results 71 to 80 of about 1,737 (200)

Characterizing Malysheva Emeralds (Urals, Russia) by Microscopy, Spectroscopy, Trace Element Chemistry, and Machine Learning

open access: yesCrystals
The Malysheva emerald mine (Urals, Russia) boasts a long history and extraordinary emerald output. However, recent studies indicate that Malysheva emeralds share highly similar inclusion varieties, UV-visible-near infrared (UV-Vis-NIR) spectra, and ...
Yu-Yu Zheng   +3 more
doaj   +1 more source

The study of precious stones and its sources in the cycle of sermons entitled „Nuptiae Agni” by Antoni Węgrzynowicz [PDF]

open access: yes, 2017
This article centers on the literary achievements of preacher Antoni Węgrzynowicz (1658-1721) from the collection Nuptiae Agni . Gody Baranka apokaliptycznego…  (Krak.w 1711) – „Nuptials of the Apocalyptic Lamb” (transl.) – in which there are, among ...
Kroczak, Jerzy
core   +2 more sources

Comparative Study of Gemological and Spectroscopic Features and Coloration Mechanism of Three Types of Spodumene

open access: yesCrystals
Spodumene is a characteristic mineral in lithium-rich granitic pegmatites, serving both as a valuable mineral resource and an important gem material. This study incorporates three different color varieties of spodumene—pink to violet, yellow-green, and ...
Zijia Zhou   +4 more
doaj   +1 more source

Purple Garnets from East Africa [PDF]

open access: yes, 2015
During the June 2015 JCK gem and jewellery show in Las Vegas, Nevada, USA, news circulated about some attractive new purple garnets from East Africa.
Hoover, Don   +2 more
core  

The Many Facets of Matthew Dearing [PDF]

open access: yes, 2012
Whether crafting custom jewelry, performing onstage or sharing the excitement of citizen science, Matthew Dearing ’00 explores life’s dynamic ...
Huttes, Celeste
core   +4 more sources

A history of the gamma-ray burst flux at the Earth from Galactic globular clusters [PDF]

open access: yes, 2013
Nearby gamma-ray bursts (GRBs) are likely to have represented a significant threat to life on the Earth. Recent observations suggest that a significant source of such bursts is compact binary mergers in globular clusters.
Bailer-Jones, Coryn A. L.   +2 more
core   +3 more sources

РЕАЛІЗАЦІЯ МІКРОТЕМИ "НАУКОВА ДИСЦИПЛІНА" В АМЕРИКАНСЬКІЙ АКАДЕМІЧНІЙ ЛЕКЦІЇ [PDF]

open access: yes, 2013
Статтю присвячено вивченню жанру американської академічної лекції, зокрема, її змістового аспекту, а саме: сегменту, що охоплює макротема 'Наукова дисципліна'. У межах цієї макротеми виокремлено підтеми та відповідні їм мікротеми.
Рябих, Л. М.
core  

DC-powered Fe3+:sapphire Maser and its Sensitivity to Ultraviolet Light

open access: yes, 2010
The zero-field Fe3+:sapphire whispering-gallery-mode maser oscillator exhibits several alluring features: Its output is many orders of magnitude brighter than that of an active hydrogen maser and thus far less degraded by spontaneous-emission (Schawlow ...
Bourgeois, Pierre-Yves   +3 more
core   +1 more source

Kewenangan Pegadaian dalam Menerbitkan Sertifikat Batu Mulia di Indonesia [PDF]

open access: yes, 2019
Authority of Pegadaian in Issuance of the Certificates of Precious Stones in Indonesia.This research aimed to determine the institution authorized to issue the certificate of the precious stones in Indonesia.
Putra, A. A. (Alif)
core  

The Saline chymistry of color in seventeenth-century English natural history [PDF]

open access: yes, 2015
Before Newton’s seminal work on the spectrum, seventeenth-century English natural philosophers such as Robert Boyle, Robert Hooke, Nehemiah Grew and Robert Plot attributed the phenomenon of color in the natural world to salts and saline chymistry.
Roos, Anna Marie
core   +1 more source

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