Natural discharge of carbon from the extremely arid land: The mode and amount of CO2 emission based on earth-air exchange

Atmospheric Pollution Research, Journal Year: 2025, Volume and Issue: unknown, P. 102437 - 102437

Published: Jan. 1, 2025

Language: Английский

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Effect of Earth‐Air Movement on Water Transport in the Rock Surrounding Cave B113 in the Mogao Grottoes

Hydrological Processes, Journal Year: 2025, Volume and Issue: 39(2)

Published: Feb. 1, 2025

ABSTRACT The degradation of wall paintings in the Mogao Grottoes, China, is primarily caused by migration water and salt surrounding rock (SR), with being key influencing factor. However, it remains unclear whether movement earth‐air, driven air pressure difference (APD) between inside SR external atmospheric (AP), affects transport rock. This study focuses on Cave B113 to investigate effect earth‐air cave's SR. Under closed conditions, APD was monitored at depths 10, 20, 30 cm within results indicate that when AP changes, fluctuates opposite direction increases depth Pearson correlation coefficients 20 are −0.31 −0.32, respectively. reflects influence serves as a driving force directly governs earth‐air. concentration vapour layers affected temperature, while relative absolute humidities these influenced ascending descending magnitude fluctuation determines volume migrates Collectively, factors determine amount evaporation occurs characteristics moisture present cave. elucidates pivotal contributing deterioration cave, providing scientific basis for developing new ways protecting paintings. It has extensive reference value vadose zone.

Language: Английский

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The Origin of Fengjian — Sealing Soil to Build <i>lv</i>: Evidence from Jade Instruments Used to Monitor Earth-air

International Journal of Archaeology, Journal Year: 2025, Volume and Issue: 13(1), P. 37 - 55

Published: April 10, 2025

Fengjian (封建), a well-known, basal political system and culture in ancient China, has long history. Similarly, jade also very history China is thus an important part of Chinese cultural heritage with many significant traits. However, the use origin jadeware been something riddle. This paper scientifically reveals how was used via simulated experiments unearthed archaeological to rebuild basic method hou-qi. The instruments utilized for hou-qi, through which determined seasonal temperatures by monitoring changes earth-air pressure. They were monitor solar terms make so-called <i>lv</i>-calendars guide farming times. present author, studying function artifacts (<i>cong</i>, <i>bi</i>, <i>mao</i>, <i>gui</i>, etc.), that originated from hou-qi at least 9,200 years ago. involved sealing soil using build <i>lv</i>s palaces create <i>lv</i>-calendars. Under setting, Eight Trigrams model theoretical basis I Ching. Therefore, begin with, kind technology underlying It prehistorical practice laid foundation pioneered civilization. have had strong influence on ideology, politics, religion, philosophy, life-style.

Language: Английский

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Radon exhalation rate prediction and early warning model based on VMD-GRU and similar day analysis

Journal of Environmental Radioactivity, Journal Year: 2024, Volume and Issue: 281, P. 107593 - 107593

Published: Dec. 2, 2024

Language: Английский

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Depth Gradient and Radon Activity Concentration in Soil Gas in the Zone of a Potentially Active Fault

Earth, Journal Year: 2024, Volume and Issue: 5(4), P. 1005 - 1022

Published: Dec. 11, 2024

The study specifies the changes in radon activity concentration (RAC) soil gas with depth and emphasizes significance of meteorological factor for deeper boreholes. Radon was measured 0.6 m, 1 m 1.5 boreholes, gradient also calculated. Spatial patterns were estimated using an autocorrelation index. RAC ranged from 9454 ± 439 Bq/m3 16,031 602 22,049 937 m. increased at most sites behaved quite uniformly spatial terms. At same time, no significant differences uranium (238U) series isotopes different depths detected. Significant variability radioactivity physical properties soils is noted. highest between It found that increasing connection conditions (temperature humidity) surface layer atmosphere lost. follows shallow boreholes it necessary to consider influence conditions. correlates but correlation themselves. Thus, are optimal monitoring. A high level indicates a potential indoor exposure this territory, corresponding epidemiological consequences long term.

Language: Английский

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Fractal discrete fracture network modeling of radon gas concentration in underground tunnels under Książ Castle in Poland

Bulletin of Engineering Geology and the Environment, Journal Year: 2024, Volume and Issue: 83(7)

Published: June 12, 2024

Abstract The numerical modeling of radon concentrations in the fault zone underground excavations at Książ Castle was conducted using a stochastic Discrete Fracture Network (DFN) model. Due to difficulties related with obtaining exact fractures rock mass, novel approach used this study incorporates model known site data. analysis utilized dataset comprising long-term measurements 222 Rn activity concentration and geodetic for twelve faults unit. parameters considered DFN are: fracture length, Peclet number ( Pe = 0.1 1.0, respectively), advection velocities (from 10 –8 m/s –6 from range –7 –4 m/s, diffusion D 2.1 × 1/s), decay constant λ gas generation q ) along within 1.5 –3 Bq/m 3 ·s 3.5 ·s. calibration process obtained best fit when rate uniformly distributed through mass addition incorporating higher value 3.0 ·s) where elevated have been measured. results also confirmed that should always be were measured regardless measurement period. For indicated “area” 25% 37.5% between May–October 18.5% 40% November–April. influence zones on recorded noticeable up depth 15 m. Within range, highest values concentration, ranging 1,600 2,000 , consistently observed season. However, as increased, decreased 800 400 became more dispersed.

Language: Английский

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Study on radon gas transport law of overlying rock layer under different geological conditions of coal spontaneous combustion

Journal of Radioanalytical and Nuclear Chemistry, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 4, 2024

Language: Английский

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