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Articles 9391 - 9420 of 52583
Full-Text Articles in Entire DC Network
Enhanced Gas Drainage Technology By Staged Fracturing In Long Bedding Borehole In Hard Coal Bed Of Underground Coal Mine And Its Application, Wang Chenyang, Li Shugang, Zhang Yongtao, Guo Yi, Sun Siqing, Chen Dongdong, Dou Chengyi
Enhanced Gas Drainage Technology By Staged Fracturing In Long Bedding Borehole In Hard Coal Bed Of Underground Coal Mine And Its Application, Wang Chenyang, Li Shugang, Zhang Yongtao, Guo Yi, Sun Siqing, Chen Dongdong, Dou Chengyi
Coal Geology & Exploration
In view of the problems of rapid attenuation, long period and low efficiency of gas drainage in hard coal bed, the enhanced gas drainage technology of increasing the permeability of coal bed by staged fracturing in long bedding borehole was put forward for the medium-to-hard coal bed. Herein, research was conducted on No.4 coal bed of Shaanxi Binchang Mining Area. Specifically, the change characteristics of micro-pore structure of coal body before and after hydraulic fracturing were comparatively analyzed by high-resolution electron microscope (SEM) in the laboratory. Meanwhile, the stress characteristics of packer and the stability of borehole were simulated with …
Floor Failure Law Of Extra-Thick Coal Seam In Fully Mechanized Caving Mining, Guo Guoqiang
Floor Failure Law Of Extra-Thick Coal Seam In Fully Mechanized Caving Mining, Guo Guoqiang
Coal Geology & Exploration
The coal mining on the high-artesian water body will cause floor disturbance and damage, and lead to the thinner effective waterproof stratum, which enhances the risk coefficient of water bursting at the floor. Grouting modification of the target horizon is an effective governing measure. However, the grouting within the floor damage scope will waste a large amount of grout and affect the project effect. Therefore, it is especially important to carry out the study of the damage depth and regularity of the coal seam floor. Accordingly, the 5105 working bench of the Yushupo Coal Mine in Shanxi was adopted as …
Study Of Constitutive Model Of Frozen Sandstone Damage Based On Weibull Distribution, Yi Ming, Zhao Tao, Ma Feifei, Wang Lei, Yuan Chao
Study Of Constitutive Model Of Frozen Sandstone Damage Based On Weibull Distribution, Yi Ming, Zhao Tao, Ma Feifei, Wang Lei, Yuan Chao
Coal Geology & Exploration
Abstract: The deformation and destruction characteristics of frozen rock is a basic mechanical problem encountered during the construction using the freezing method. Under the action of load, the mechanical characteristics and deformation characteristics are greatly different for the rock with different freezing temperatures, which significantly affects the safety and stability of the freezing wall. Therefore, the study of the damage constitutive relation of the frozen rock is significant for instructing the freezing method design and construction. In order to analyze the whole process of the frozen rock deformation and destruction under load action, the Weibull distribution was adopted to describe …
Analysis On Spatio-Temporal Evolution Law Of Freezing Temperature Field In Eastern Shaft Of Qinan Coal Mine, Huang Shiqing, Rong Chuanxin, Long Wei, Ma Haochen, He Junzhen
Analysis On Spatio-Temporal Evolution Law Of Freezing Temperature Field In Eastern Shaft Of Qinan Coal Mine, Huang Shiqing, Rong Chuanxin, Long Wei, Ma Haochen, He Junzhen
Coal Geology & Exploration
Three numerical calculation models of the freezing temperature fields with different soil nature and different burial depths, i.e. the calcareous clay horizon with the burial depth of 218 m, the fine sand horizon with the burial depth of 225 m and the sandy clay horizon with the burial depth of 259 m, were established respectively using the finite element software COMSOL Multiphysics based on the actual forming locations of freezing holes, with the engineering background of using the freezing method in shaft sinking for the eastern air shaft of Qinan Coal Mine Anhui Province and the study object of the …
Experimental Study On Power Matching Of Modular Double Pumping Stations Of Tunnel Drilling Rig, Lu Feifei, Fan Dong, Tian Hongliang
Experimental Study On Power Matching Of Modular Double Pumping Stations Of Tunnel Drilling Rig, Lu Feifei, Fan Dong, Tian Hongliang
Coal Geology & Exploration
In order to solve the problems of heavy weight, relocation and transportation of the power pumping station of tunnel drilling rigs, it is proposed to divide the pumping station through modular design, and adopt the solution of small-displacement, dual-power and dual-pump confluence, effectively reducing the transportation size and weight of a single pump station. A single-pump station or a double-pump confluence is chosen according to the working conditions to improve the flexibility of the drilling rig and reduce energy consumption. The load-sensing system has the advantages of energy saving, good load adaptability, and convenient speed regulation. However, when the dual-load-sensing …
Comments For The Draft Final Butte Priority Soils Operable Unit, Draft Final 2021 Unreclaimed Sites Sampling Ruby Street (Ur-05) Site Evaluation Summary Report (May 2022), Nikia Greene
Silver Bow Creek/Butte Area Superfund Site
No abstract provided.
Silver Bow Creek Butte Area Npl Site 2nd Quarter 2022 Butte Priority Soils Operable Unit Interim Site-Wide Surface Water Monitoring Data Report. Consent Decree- Civil Action No. Cv 89-039-Bu-She, Josh Bryson
Silver Bow Creek/Butte Area Superfund Site
No abstract provided.
Approval Of The Butte Priority Soils Operable Unit (Bpsou) Revised Draft Final 2021 Groundwater Monitoring Data Summary Report, January 2021 – December 2021 (Dated July 20, 2022), Nikia Greene
Silver Bow Creek/Butte Area Superfund Site
No abstract provided.
1st Sem 2022 Bpsou Gw Data, Woodard & Curran, Hannah Foster
1st Sem 2022 Bpsou Gw Data, Woodard & Curran, Hannah Foster
Silver Bow Creek/Butte Area Superfund Site
No abstract provided.
Overall Data Summary, Pioneer Technical Services, Inc., Environmental Protection Agency
Overall Data Summary, Pioneer Technical Services, Inc., Environmental Protection Agency
Silver Bow Creek/Butte Area Superfund Site
No abstract provided.
2022 Q2 Bpsou Sw, Environmental Protection Agency, Pioneer Technical Services, Inc.
2022 Q2 Bpsou Sw, Environmental Protection Agency, Pioneer Technical Services, Inc.
Silver Bow Creek/Butte Area Superfund Site
No abstract provided.
Tables A1, A2, A3, A4, A5 2021, Pioneer Technical Services, Inc., Environmental Protection Agency
Tables A1, A2, A3, A4, A5 2021, Pioneer Technical Services, Inc., Environmental Protection Agency
Silver Bow Creek/Butte Area Superfund Site
No abstract provided.
Collateral Damage From Agricultural Netting To Open-Country Bird Populations In Thailand, Rongrong Angkaew, Philip D. Round, Dusit Ngoprasert, Larkin A. Powell
Collateral Damage From Agricultural Netting To Open-Country Bird Populations In Thailand, Rongrong Angkaew, Philip D. Round, Dusit Ngoprasert, Larkin A. Powell
School of Natural Resources: Faculty Publications
Nets are used across a wide variety of food production landscapes to control avian pests typically resulting in deaths of entangled birds. However, the impact of nets on bird populations is a human–wildlife conflict that remains mostly unquantified. Here, we examined the scale of netting in the central plains of Thailand, a region dominated by ricefields, among which aquaculture ponds are increasingly interspersed. Nets/exclusion types, number of individual birds and species caught were recorded on 1312 road-survey transects (2-km length × 0.4-km width). We also interviewed 104 local farmers. The transect sampling took place in late- September 2020, and from …
2021 2q Btl Daily Pts Field Dump, Environmental Protection Agency, Pioneer Technical Services, Inc.
2021 2q Btl Daily Pts Field Dump, Environmental Protection Agency, Pioneer Technical Services, Inc.
Silver Bow Creek/Butte Area Superfund Site
No abstract provided.
2019 - 2021 Wsssou Data For Gis, Pioneer Technical Services, Inc.
2019 - 2021 Wsssou Data For Gis, Pioneer Technical Services, Inc.
Silver Bow Creek/Butte Area Superfund Site
No abstract provided.
2021 2q Btl Chem Dump, Environmental Protection Agency, Pioneer Technical Services, Inc.
2021 2q Btl Chem Dump, Environmental Protection Agency, Pioneer Technical Services, Inc.
Silver Bow Creek/Butte Area Superfund Site
No abstract provided.
2021 Second Quarter Laboratory Edd, Environmental Protection Agency, Pioneer Technical Services, Inc.
2021 Second Quarter Laboratory Edd, Environmental Protection Agency, Pioneer Technical Services, Inc.
Silver Bow Creek/Butte Area Superfund Site
No abstract provided.
Electronic Data Wssou For Dsr, Environmental Protection Agency, Pioneer Technical Services, Inc.
Electronic Data Wssou For Dsr, Environmental Protection Agency, Pioneer Technical Services, Inc.
Silver Bow Creek/Butte Area Superfund Site
No abstract provided.
Yankees In The Indian Ocean : American Commerce And Whaling, 1786–1860, Jane Hooper
Yankees In The Indian Ocean : American Commerce And Whaling, 1786–1860, Jane Hooper
Ohio University Press Open Access Books
The history of US imperialism remains incomplete without this consideration of long-overlooked nineteenth-century American commercial and whaling ventures in the Indian Ocean.
Yankees in the Indian Ocean shows how nineteenth-century American merchant and whaler activity in the Indian Ocean shaped the imperial future of the United States, influenced the region’s commerce, encouraged illegal slaving, and contributed to environmental degradation. For a brief time, Americans outnumbered other Western visitors to Mauritius, Madagascar, Zanzibar, and the East African littoral. In a relentless search for commodities and provisions, American whaleships landed at islands throughout the ocean and stripped them of resources. Yet Americans …
10577877 Edd, Environmental Protection Agency, Pioneer Technical Services, Inc.
10577877 Edd, Environmental Protection Agency, Pioneer Technical Services, Inc.
Silver Bow Creek/Butte Area Superfund Site
No abstract provided.
2021 3q Btl Daily Pts Field Dump, Environmental Protection Agency, Pioneer Technical Services, Inc.
2021 3q Btl Daily Pts Field Dump, Environmental Protection Agency, Pioneer Technical Services, Inc.
Silver Bow Creek/Butte Area Superfund Site
No abstract provided.
10585806 Edd, Pioneer Technical Services, Inc., Environmental Protection Agency
10585806 Edd, Pioneer Technical Services, Inc., Environmental Protection Agency
Silver Bow Creek/Butte Area Superfund Site
No abstract provided.
10578145, Pioneer Technical Services, Inc., Environmental Protection Agency
10578145, Pioneer Technical Services, Inc., Environmental Protection Agency
Silver Bow Creek/Butte Area Superfund Site
No abstract provided.
2021 3q Btl Chemdump, Pioneer Technical Services, Inc., Environmental Protection Agency
2021 3q Btl Chemdump, Pioneer Technical Services, Inc., Environmental Protection Agency
Silver Bow Creek/Butte Area Superfund Site
No abstract provided.
2021 3q Laboratory Edds, Pioneer Technical Services, Inc., Environmental Protection Agency
2021 3q Laboratory Edds, Pioneer Technical Services, Inc., Environmental Protection Agency
Silver Bow Creek/Butte Area Superfund Site
No abstract provided.
2021 Btl O&M Events Log / 2021 Daily Log, Pioneer Technical Services, Inc., Environmental Protection Agency
2021 Btl O&M Events Log / 2021 Daily Log, Pioneer Technical Services, Inc., Environmental Protection Agency
Silver Bow Creek/Butte Area Superfund Site
No abstract provided.
Seasonality Of Precipitation In The Southwestern United States During The Late Pleistocene Inferred From Stable Isotopes In Herbivore Tooth Enamel, Matthew J. Kohn, Kathleen B. Springer, Jeffrey S. Pigati, Linda M. Reynard, Amanda E. Drewicz, Justin Crevier, Eric Scott
Seasonality Of Precipitation In The Southwestern United States During The Late Pleistocene Inferred From Stable Isotopes In Herbivore Tooth Enamel, Matthew J. Kohn, Kathleen B. Springer, Jeffrey S. Pigati, Linda M. Reynard, Amanda E. Drewicz, Justin Crevier, Eric Scott
United States Geological Survey: Staff Publications
The late Pleistocene was a climatically dynamic period, with abrupt shifts between cool-wet and warmdry conditions. Increased effective precipitation supported large pluvial lakes and long-lived spring ecosystems in valleys and basins throughout the western and southwestern U.S., but the source and seasonality of the increased precipitation are debated. Increases in the proportions of C4/(C4+ C3) grasses in the diets of large grazers have been ascribed both to increases in summer precipitation and lower atmospheric CO2 levels. Here we present stable carbon and oxygen isotope data from tooth enamel of late Pleistocene herbivores recovered …
Innovative Measure On Achieving Common Prosperity: Carbon Transfer Payment, Peili Lu, Lanling Peng, Jiaqi Shen, Yanrui Jin, Yong Geng
Innovative Measure On Achieving Common Prosperity: Carbon Transfer Payment, Peili Lu, Lanling Peng, Jiaqi Shen, Yanrui Jin, Yong Geng
Bulletin of Chinese Academy of Sciences (Chinese Version)
To achieve carbon peak and carbon neutrality, as well as common prosperity, is the key decision of the Chinese government. By addressing coordinated regional development and based upon balanced and reasonable distribution of income and carbon emission rights principles, the study aims to develop an equilibrium model to achieve regional carbon transfer payment. Carbon transfer payment can help adjust regional fiscal revenues so that the income distribution system is more in line with the scientific normal distribution characteristics under the common prosperity goal. Such a measure can address both equity and efficiency, balance carbon emission rights and development rights, contribute …
Systematic Study On Carbon Emission Reduction Of Municipal Solid Waste Treatment, Jisheng Long, Hailiang Du, Xin Zou, Jingying Huang
Systematic Study On Carbon Emission Reduction Of Municipal Solid Waste Treatment, Jisheng Long, Hailiang Du, Xin Zou, Jingying Huang
Bulletin of Chinese Academy of Sciences (Chinese Version)
Under the context of China's carbon peak and carbon neutrality, the treatment of municipal solid waste (MSW) is facing new challenge to reduce carbon emission. This study suggests that significant carbon emission reduction and dual cycle of mass and energy can be realized, under the context of MSW classification, by the collaborative treatment of multi-source solid waste in Eco-Industrial Park. Results showed that in 2020, the incineration and landfilling of MSW in China reduced 5.18 million tons of CO2 emission, at the same year, 15 million tons of CO2 emission could have been reduced if the wet waste was treated …
Forest Fire Effects On Landscape Snow Albedo Recovery And Decay, Max Gersh, Kelly E. Gleason, Anton Surunis
Forest Fire Effects On Landscape Snow Albedo Recovery And Decay, Max Gersh, Kelly E. Gleason, Anton Surunis
Environmental Science and Management Faculty Publications and Presentations
Surface snow albedo (SSA) darkens immediately following a forest fire, while landscape snow albedo (LSA) brightens as more of the snow-covered surface becomes visible under the charred canopy. The duration and variability of the post-fire snow albedo recovery process remain unknown beyond a few years following the fire. We evaluated the temporal variability of post-fire snow albedo recovery relative to burn severity across a chronosequence of eight burned forests burned from 2000 to 2019, using pre- and post-fire daily, seasonal, and annual landscape snow albedo data derived from the Moderate Resolution Imaging Spectroradiometer (MOD10A1). Post-fire annual LSA increased by 21% …