scholarly journals Use of Ga for mass bias correction for the accurate determination of copper isotope ratio in the NIST SRM 3114 Cu standard and geological samples by MC-ICPMS

2016 ◽  
Vol 31 (1) ◽  
pp. 280-287 ◽  
Author(s):  
QingHua Hou ◽  
Lian Zhou ◽  
Shan Gao ◽  
Ting Zhang ◽  
Lanping Feng ◽  
...  

The absolute determination of the Cu isotope ratio in NIST SRM 3114 based on a regression mass bias correction model is performed for the first time with NIST SRM 944 Ga as the calibrant.

2016 ◽  
Vol 31 (6) ◽  
pp. 1287-1297 ◽  
Author(s):  
Jie Liu ◽  
Hanjie Wen ◽  
Yuxu Zhang ◽  
Haifeng Fan ◽  
Chuanwei Zhu

The double-spike (DS) mass bias correction approach was the method of choice for geological samples with <0.5 μg g−1 Mo; both the double-spike and the sample-standard bracketing (SSB) approaches could be applied for samples with >0.5 μg g−1 Mo. This method provided a wide range of applications for most Mo reservoirs in geological processes.


2016 ◽  
Vol 31 (8) ◽  
pp. 1673-1679 ◽  
Author(s):  
Ting Zhang ◽  
Lian Zhou ◽  
Lu Yang ◽  
Qian Wang ◽  
Lan-ping Feng ◽  
...  

A new MC-ICP-MS approach is reported for highly precise and accurate determination of the Ga isotope ratio in geological samples.


2008 ◽  
Vol 23 (9) ◽  
pp. 1269 ◽  
Author(s):  
Lu Yang ◽  
Charlotte Peter ◽  
Ulrich Panne ◽  
Ralph E. Sturgeon

2019 ◽  
Vol 12 (10) ◽  
pp. 5503-5517 ◽  
Author(s):  
Pascal Hedelt ◽  
Dmitry S. Efremenko ◽  
Diego G. Loyola ◽  
Robert Spurr ◽  
Lieven Clarisse

Abstract. The accurate determination of the location, height, and loading of sulfur dioxide (SO2) plumes emitted by volcanic eruptions is essential for aviation safety. The SO2 layer height is also one of the most critical parameters with respect to determining the impact on the climate. Retrievals of SO2 plume height have been carried out using satellite UV backscatter measurements, but, until now, such algorithms are very time-consuming. We have developed an extremely fast yet accurate SO2 layer height retrieval using the Full-Physics Inverse Learning Machine (FP_ILM) algorithm. This is the first time the algorithm has been applied to measurements from the TROPOMI instrument onboard the Sentinel-5 Precursor platform. In this paper, we demonstrate the ability of the FP_ILM algorithm to retrieve SO2 plume layer heights in near-real-time applications with an accuracy of better than 2 km for SO2 total columns larger than 20 DU. We present SO2 layer height results for the volcanic eruptions of Sinabung in February 2018, Sierra Negra in June 2018, and Raikoke in June 2019, observed by TROPOMI.


2018 ◽  
Vol 17 (2) ◽  
pp. 245-255 ◽  
Author(s):  
S. A. R. Shahamirifard ◽  
M. Ghaedi ◽  
M. Montazerozohori ◽  
A. Masoudiasl

In this work, the use of carbon dots (CDs) as a complexing agent and sensitizer in a polymeric matrix for determination of copper(ii) by UV-vis spectroscopy is reported for the first time.


2020 ◽  
Vol 92 (24) ◽  
pp. 16097-16104
Author(s):  
Jakub Karasiński ◽  
Andriy Tupys ◽  
Lu Yang ◽  
Zoltan Mester ◽  
Ludwik Halicz ◽  
...  

2011 ◽  
Vol 26 (6) ◽  
pp. 1237 ◽  
Author(s):  
Yue-Heng Yang ◽  
Zhu-Yin Chu ◽  
Fu-Yuan Wu ◽  
Lie-Wen Xie ◽  
Jin-Hui Yang

2017 ◽  
Vol 90 (4) ◽  
pp. 311-333 ◽  
Author(s):  
Julien Benoit ◽  
Vincent Fernandez ◽  
Paul R. Manger ◽  
Bruce S. Rubidge

The origin and evolution of the mammalian brain has long been the focus of scientific enquiry. Conversely, little research has focused on the palaeoneurology of the stem group of Mammaliaformes, the Permian and Triassic non-mammaliaform Therapsida (NMT). This is because the majority of the NMT have a non-ossified braincase, making the study of their endocranial cast (sometimes called the “fossil brain”) problematic. Thus, descriptions of the morphology and size of NMT endocranial casts have been based largely on approximations rather than reliable determination. Accordingly, here we use micro-CT scans of the skulls of 1 Dinocephalia and 3 Biarmosuchia, which are NMT with a fully ossified braincase and thus a complete endocast. For the first time, our work enables the accurate determination of endocranial shape and size in NMT. This study suggests that NMT brain size falls in the upper range of the reptilian and amphibian variation. Brain size in the dicynodont Kawingasaurus is equivalent to that of early Mammaliaformes, whereas the Dinocephalia show evidence of a secondary reduction of brain size. In addition, unlike other NMT in which the endocast has a tubular shape and its parts are arranged in a linear manner, the biarmosuchian endocast is strongly flexed at the level of the midbrain, creating a near right angle between the fore- and hindbrain. These data highlight an unexpected diversity of endocranial size and morphology in NMT, features that are usually considered conservative in this group.


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