scholarly journals Improving prediction of radioactive gas seepage for nuclear testing treaty verification

2019 ◽  
Author(s):  
Kirsten Shaw Fox
Keyword(s):  
Nuclear Testing ◽  
Treaty Verification ◽  
Gas Seepage

GEOPHYSICAL STUDIES OF SUBSURFACE GAS SEEPAGE IN SAND-CLAY SOILS

2018 ◽  
Vol 12 (3-4) ◽  
pp. 70-80
Author(s):  
A. D. Skobelev ◽  
E. Yu. Matlakhova ◽  
S. V. Serebryakov ◽  
A. P. Ermakov ◽  
I. N. Modin ◽  
...  
Keyword(s):  
Clay Soils ◽  
Gas Seepage

scholarly journals 14C INTERCOMPARISON EXERCISE ON BONES AND IVORY SAMPLES: IMPLICATIONS FOR FORENSICS

Radiocarbon ◽  
2021 ◽  
pp. 1-12
Author(s):  
G Quarta ◽  
M Molnár ◽  
I Hajdas ◽  
L Calcagnile ◽  
I Major ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
International Atomic Energy Agency ◽  
Accelerator Mass Spectrometry ◽  
Reference Curve ◽  
Nuclear Testing ◽  
Energy Agency ◽  
Widespread Application ◽  
Intercomparison Exercise ◽  
High Degree ◽  
Data Calibration

ABSTRACT The application of accelerator mass spectrometry radiocarbon (AMS 14C) dating in forensics is made possible by the use of the large excursion of the 14C concentration in the post-WWII terrestrial atmosphere due to nuclear testing as a reference curve for data calibration. By this approach high-precision analyses are possible on samples younger than ∼70 years. Nevertheless, the routine, widespread application of the method in the practice of forensics still appears to be limited by different issues due to possible complex interpretation of the results. We present the results of an intercomparison exercise carried out in the framework of an International Atomic Energy Agency (IAEA) CRP-Coordinated Research Project between three AMS laboratories in Italy, Hungary, and Switzerland. Bone and ivory samples were selected with ages spanning from background (>50 ka) to 2018. The results obtained allow us to assess the high degree of reproducibility of the results and the remarkable consistency of the experimental determinations.

scholarly journals Coupled Effects of Stress, Moisture Content and Gas Pressure on the Permeability Evolution of Coal Samples: A Case Study of the Coking Coal Resourced from Tunlan Coalmine

Water ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 1653
Author(s):  
Guofu Li ◽  
Yi Wang ◽  
Junhui Wang ◽  
Hongwei Zhang ◽  
Wenbin Shen ◽  
...  
Keyword(s):  
Moisture Content ◽  
Coalbed Methane ◽  
Gas Permeability ◽  
Axial Stress ◽  
Gas Pressure ◽  
Pressure Curve ◽  
Permeability Evolution ◽  
Confining Stress ◽  
Qinshui Basin ◽  
Gas Seepage

Deep coalbed methane (CBM) is widely distributed in China and is mainly commercially exploited in the Qinshui basin. The in situ stress and moisture content are key factors affecting the permeability of CH4-containing coal samples. Therefore, considering the coupled effects of compressing and infiltrating on the gas permeability of coal could be more accurate to reveal the CH4 gas seepage characteristics in CBM reservoirs. In this study, coal samples sourced from Tunlan coalmine were employed to conduct the triaxial loading and gas seepage tests. Several findings were concluded: (1) In this triaxial test, the effect of confining stress on the permeability of gas-containing coal samples is greater than that of axial stress. (2) The permeability versus gas pressure curve of coal presents a ‘V’ shape evolution trend, in which the minimum gas permeability was obtained at a gas pressure of 1.1MPa. (3) The gas permeability of coal samples decreased exponentially with increasing moisture content. Specifically, as the moisture content increasing from 0.18% to 3.15%, the gas permeability decreased by about 70%. These results are expected to provide a foundation for the efficient exploitation of CBM in Qinshui basin.

scholarly journals The Carter Administration and the Evolution of American Nuclear Nonproliferation Policy, 1977–1981

2002 ◽  
Vol 14 (3) ◽  
pp. 261-292 ◽  
Author(s):  
J. Michael Martinez
Keyword(s):  
Soviet Union ◽  
Nuclear Weapons ◽  
Nuclear Nonproliferation ◽  
Nuclear Testing ◽  
Energy Agency ◽  
The Soviet Union ◽  
Subsequent Response ◽  
The World ◽  
Uncertain Time ◽  
First Time

In the wake of India's May 1998 decision to resume nuclear testing for the first time since 1974, as well as arch-rival Pakistan's subsequent response, the attention of the world again has focused on nuclear nonproliferation policy as a means of maintaining stability in politically troubled regions of the world. The 1990s proved to be an uncertain time for nonproliferation policy. Pakistan acquired nuclear capabilities. Iraq displayed its well-known intransigence by refusing to allow International Atomic Energy Agency (IAEA) arms inspectors access to facilities suspected of manufacturing nuclear weapons. North Korea maintained a nuclear weapons program despite opposition from many Western nations. Troubling questions about nuclear holdings persisted in Argentina, Brazil, and South Africa. New nuclear powers were created in Belarus, Kazakhstan, Russia, and Ukraine after the disintegration of the Soviet Union. Even the renewal of the Treaty on the Non-Proliferation of Nuclear Weapons in 1995 failed to assuage the concerns of Western powers fearful of aggressive measures undertaken by rogue nuclear proliferants.

Nuclear Testing: The Rival Series Are Not Likely To Go On and On

Science ◽  
1962 ◽  
Vol 136 (3514) ◽  
pp. 375-376
Author(s):  
H. Margolis
Keyword(s):  
Nuclear Testing
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