Mine Water Irruption Flooding Spread Route Generation Algorithm Based on Directed Graph

2012 ◽  
Vol 268-270 ◽  
pp. 1894-1897
Author(s):  
Hui Fu ◽  
Shan Jun Mao ◽  
Yun Xiu Luo
Keyword(s):  
Mine Water ◽  
Water Inrush ◽  
Scientific Basis ◽  
Route Optimization ◽  
Generation Algorithm ◽  
Emergency Rescue ◽  
Point Extension ◽  
Starting Point ◽  
Control Work ◽  
And Control

In view of roadway complex spatial relationships, the lack of visual expression in the mine water prevention and control work, this paper gives the water irruption flooding spread generation algorithm. Based on building tree topology from water inrush starting point extension and simulating of water down to spread and water level to rise, the algorithm generates flooding route and establishes water inrush 3D simulation system. It provides scientific basis for developing disaster relief route optimization and emergency rescue decision-making.

scholarly journals Hydrogeochemical Evolution and Control Mechanism of Underground Multiaquifer System in Coal Mine Area

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Qiding Ju ◽  
Yu Liu ◽  
Youbiao Hu ◽  
Yuquan Wang ◽  
Qimeng Liu ◽  
...  
Keyword(s):  
Cation Exchange ◽  
Mine Water ◽  
Control Mechanism ◽  
Water Inrush ◽  
Pyrite Oxidation ◽  
Mining Area ◽  
Carbonate Dissolution ◽  
Mining Activities ◽  
Hydrogeochemical Evolution ◽  
And Control

Mining activities interfere into the natural groundwater chemical environment, which may lead to hydrogeochemical changes of aquifers and mine water inrush disasters. The study of hydrogeochemical evolution processes of underground aquifers is helpful to the prevention and control of mine water inrush. The results show that the study area is mainly impacted by four hydrogeochemical processes: dissolution, cation exchange, desulfurization and reduction, and pyrite oxidation. The Cenozoic aquifers are dominated by carbonate dissolution and desulfurization. The Permian aquifers are impacted mainly by cation exchange and sulfate dissolution, followed by pyrite oxidation. The Carboniferous aquifers are mainly impacted by dissolving sulfate, followed by pyrite oxidation and cation exchange. The hydrogeochemical evolution of the aquifers was controlled by mining activities and tectonic changes, and a certain regularity in space. For the Cenozoic aquifers, sulfate dissolution and cation exchange increase from west to east, and desulfurization weakens. For the Permian aquifers, cation exchange and sulfate dissolution are stronger near synclines and faults, pyrite oxidation is enhanced, and desulfurization decreases from the middle to the east of the mining area. For the Carboniferous aquifers, there is a higher dissolution of rock salt, pyrite oxidation, and cation exchange from west to east, and the desulfurization effect weakens.

Groundwater flow simulation and its application in GaoSong ore field, China

2018 ◽  
Vol 10 (2) ◽  
pp. 276-284 ◽  
Author(s):  
Gang Chen ◽  
Shiguang Xu ◽  
Chunxue Liu ◽  
Lei Lu ◽  
Liang Guo
Keyword(s):  
Numerical Model ◽  
Flow Field ◽  
Groundwater Flow ◽  
Mine Water ◽  
Permeability Coefficient ◽  
Water Inrush ◽  
Seepage Field ◽  
Groundwater Seepage ◽  
Calculation Results ◽  
Groundwater Flow Field

Abstract Mine water inrush is one of the important factors threatening safe production in mines. The accurate understanding of the mine groundwater flow field can effectively reduce the hazards of mine water inrush. Numerical simulation is an important method to study the groundwater flow field. This paper numerically simulates the groundwater seepage field in the GaoSong ore field. In order to ensure the accuracy of the numerical model, the research team completed 3,724 field fissure measurements in the study area. The fracture measurement results were analyzed using the GEOFRAC method and the whole-area fracture network data were generated. On this basis, the rock mass permeability coefficient tensor of the aquifer in the study area was calculated. The tensor calculation results are used in the numerical model of groundwater flow. After calculation, the obtained numerical model can better represent the groundwater seepage field in the study area. In addition, we designed three different numerical models for calculation, mainly to explore the influence of the tensor assignment of permeability coefficient on the calculation results of water yield of the mine. The results showed that irrational fathom tensor assignment would cause a significant deviation in calculation results.

The Gift of Solidarity: Women Navigating Jewellery Work and Patriarchal Norms in Rural West Bengal, India

2021 ◽  
pp. 097317412098457
Author(s):  
Sarasij Majumder
Keyword(s):  
Informal Sector ◽  
West Bengal ◽  
Family Members ◽  
Informal Networks ◽  
Formal Economy ◽  
Women's Participation ◽  
The Gift ◽  
Control Work ◽  
And Control ◽  
Urban Villages

In the context of declining women’s participation in the formal economy in India, this paper looks at how women’s work in the informal sector of jewellery-making emerges as gift. Gendered discourses on work turn men, who worked as labourers, into supervisors who monitor and control work situations and sort and grade final products in jewellery workshops. Following Anna Tsing, I argue that jewellery products start their lives as gifts but as they move from women (who are seen as housewives and family members) to men (who are seen as professionals/experts within the workshop) and beyond, they become commodities. This journey from gift to commodity within the workshop is made possible by a gendered discourse on work and by the dynamics within small landholding middle-caste households. Further, I underscore that women’s informal networks often help them cope with the emotional and affective tensions of work and the demands imposed on them by the men and their own households. Women facilitate the transition from gift to commodity by colluding amongst themselves to work in these informal spaces to maintain household status within peri-urban villages of West Bengal.

scholarly journals Practices of sustainability and the enactment of their natures/cultures: Ecosystem services, rights of nature, and geoengineering

2021 ◽  
pp. 053901842199894
Author(s):  
Frank Adloff ◽  
Iris Hilbrich
Keyword(s):  
Ecosystem Services ◽  
Latin American ◽  
Social Systems ◽  
The Earth ◽  
Starting Point ◽  
Knowledge Cultures ◽  
Rights Of Nature ◽  
Value Of Nature ◽  
The One ◽  
And Control

Possible trajectories of sustainability are based on different concepts of nature. The article starts out from three trajectories of sustainability (modernization, transformation and control) and reconstructs one characteristic practice for each path with its specific conceptions of nature. The notion that nature provides human societies with relevant ecosystem services is typical of the path of modernization. Nature is reified and monetarized here, with regard to its utility for human societies. Practices of transformation, in contrast, emphasize the intrinsic ethical value of nature. This becomes particularly apparent in discourses on the rights of nature, whose starting point can be found in Latin American indigenous discourses, among others. Control practices such as geoengineering are based on earth-systemic conceptions of nature, in which no distinction is made between natural and social systems. The aim is to control the earth system as a whole in order for human societies to remain viable. Practices of sustainability thus show different ontological understandings of nature (dualistic or monistic) on the one hand and (implicit) ethics and sacralizations (anthropocentric or biocentric) on the other. The three reconstructed natures/cultures have different ontological and ethical affinities and conflict with each other. They are linked to very different knowledge cultures and life-worlds, which answer very differently to the question of what is of value in a society and in nature and how these values ought to be protected.

CAEP/9-agreed certification requirement for the Aeroplane CO2Emissions Standard: a comment on ICAO Cir 337

2016 ◽  
Vol 120 (1226) ◽  
pp. 693-723 ◽  
Author(s):  
J.E. Green ◽  
J.A. Jupp
Keyword(s):  
Fuel Efficiency ◽  
Scientific Basis ◽  
Civil Aviation ◽  
Aircraft Emissions ◽  
Current Form ◽  
Fuel Burn ◽  
Aircraft Fuel ◽  
Starting Point ◽  
Range Equation ◽  
Main Criticism

ABSTRACTThe International Civil Aviation Organization (ICAO) Circular Cir 337 is the first step towards ICAO establishing an Aeroplane CO2Emissions Standard to form part of Annex 16, Volume III to the Chicago Convention. It describes itself as ‘a work in progress’. This paper reviews Cir 337 against the background of flight physics, the published literature on aircraft fuel burn and CO2emissions and the current practices of the aircraft and engine manufacturers and the airline operators. We have taken, as our starting point, the aim of ICAO to reduce the fuel used per revenue tonne-kilometre performed and argue that the Breguet range equation, which captures all the relevant flight physics, should be the basis of the metric system underpinning the standard. Our overall conclusion is that Cir 337 provides an excellent basis for the initial regulation of aviation's CO2emissions and, further in the future, for developing measures to increase the fuel efficiency of the operational side of civil aviation. Our main criticism of the circular in its current form is that it does not address the ICAO goal of reducingfuel used per revenue tonne-kilometre performedand makes no reference to payload. This defect could be eliminated simply by omission of the exponent 0.24 of the Reference Geometric Factor (RGF) in the formula for the metric given in Chapter 2 (paragraph 2.2) of the circular. Retaining theRGFto the power unity in the metric and multiplying it by an appropriate value of the effective floor loading would convert it to what the 37thAssembly of ICAO called for – a statement of fuel used per revenue tonne-kilometre performed. Finally, correlating the amended metric against design range, as determined from the measured specific air range and the key certificated masses, provides a sound scientific basis for an initial regulation to cap passenger aircraft emissions.

scholarly journals Activity and Mechanism of Action of Antifungal Peptides from Microorganisms: A Review

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3438
Author(s):  
Tianxi Li ◽  
Lulu Li ◽  
Fangyuan Du ◽  
Lei Sun ◽  
Jichao Shi ◽  
...  
Keyword(s):  
Mechanisms Of Action ◽  
Antifungal Drugs ◽  
Drug Resistant ◽  
Important Research ◽  
Factors Affecting ◽  
Natural Substances ◽  
Therapeutic Drugs ◽  
Antifungal Peptides ◽  
Control Work ◽  
And Control

Harmful fungi in nature not only cause diseases in plants, but also fungal infection and poisoning when people and animals eat food derived from crops contaminated with them. Unfortunately, such fungi are becoming increasingly more resistant to traditional synthetic antifungal drugs, which can make prevention and control work increasingly more difficult to achieve. This means they are potentially very harmful to human health and lifestyle. Antifungal peptides are natural substances produced by organisms to defend themselves against harmful fungi. As a result, they have become an important research object to help deal with harmful fungi and overcome their drug resistance. Moreover, they are expected to be developed into new therapeutic drugs against drug-resistant fungi in clinical application. This review focuses on antifungal peptides that have been isolated from bacteria, fungi, and other microorganisms to date. Their antifungal activity and factors affecting it are outlined in terms of their antibacterial spectra and effects. The toxic effects of the antifungal peptides and their common solutions are mentioned. The mechanisms of action of the antifungal peptides are described according to their action pathways. The work provides a useful reference for further clinical research and the development of safe antifungal drugs that have high efficiencies and broad application spectra.

scholarly journals Introduction of Sorghum (Sorghum bicolor (L.) Moench) green manure in rotations of head salads and baby leaf crops under greenhouse

2016 ◽  
Vol 11 ◽  
Author(s):  
Luigi Morra ◽  
Domenico Cerrato ◽  
Maurizio Bilotto ◽  
Salvatore Baiano
Keyword(s):  
Organic Carbon ◽  
Total Nitrogen ◽  
Green Manure ◽  
Soil C ◽  
C Balance ◽  
Soil Biomass ◽  
Starting Point ◽  
Dry Biomass ◽  
One Year ◽  
And Control

This paper deals with the introduction in tunnel-greenhouses of sweet sorghum cultivated in short, summer cycle as green manure with the aim to amend soils with biomass grown on farm. This practice has been spreading in tunnels of Sele river Valley (Salerno, Italy) where baby leaf crops are cultivated in numerous cycles (up to 5-7) per year. Three sorghum varieties for forage or biomass (Goliath, BMR 201 and BMR 333) were cultivated in two farms at Eboli and San Marzano sul Sarno with the aims to study their responses in term of fresh and dry aboveground biomass yielded, C and N content of the biomass incorporated in soil, C balance in amended soils after one year of ordinary cash crop sequences. No differences, with regard to all the parameters measured, were pointed out among the tested varieties in each site. The sorghum cycle lasted 45 days at Eboli, yielding on average 98 and 13 t ha<sup>-1</sup> of fresh and dry biomass, respectively; soil biomass incorporation supplied, on average 5.8 t ha<sup>-1</sup> of organic carbon and 273 kg ha<sup>-1</sup> of total nitrogen. In the farm of San Marzano, sorghum cycle lasted 68 days, yielding 116 and 18 t ha<sup>-1</sup> of fresh and dry biomass, respectively; soil biomass incorporation supplied, on average 8 t ha<sup>-1</sup> of organic carbon and 372 kg ha<sup>-1</sup> of total nitrogen. After one year, the plots amended with sorghum biomass showed a soil organic carbon (SOC) concentration not different from the starting point while SOC decreased in fallow plots. At Eboli, initial SOC content was 12.3 g kg<sup>-1</sup>, but one year later it resulted 12.3, 12.8, 12.2 and 11.3 g kg<sup>-1</sup> in BMR 201, BMR 333, Goliath and control plots, respectively. At San Marzano initial SOC content was 11.4 g kg<sup>-1</sup>, but one year later it resulted 11, 12, 10.7 and 10.5 g kg<sup>-1</sup> in BMR 201, BMR 333, Goliath and control plots, respectively. The annual C balance put in evidence that the green manure with sorghum biomass caused SOC losses higher than those detected in fallow plots let us supposing a prime effect in boosting the soil microbial C mineralization. Only cv BMR 333 in the Eboli trial, pointed out a positive SOC change of 1.8 t ha<sup>-1</sup>. Further studies are requested to better understand the real efficacy of sorghum cover crop in soil amendment under tunnels devoted to intensive vegetable crop sequence.

Sign in / Sign up

Export Citation Format

Share Document