Results 91 to 100 of about 23,540 (196)

Conception of coordinated development technology system for coalbed methane and underground coal gasification in inclined coal seams

Meitan kexue jishu
Coalbed methane (CBM) development and underground coal gasification (UCG) are important sources for coal-based natural gas production in China, and coal and CBM resources are abundant in the inclined coalbed development area of the Xinjiang foreland ...
Bo WEI, Shuguang YANG, Xin LI, Shuangming WANG, Qingmin SHI, Lanhe YANG, Gang WANG, Xuehai FU, Hongmei SU, Chao JIA, Zhenpeng HU, Chen ZHAO   +11 more
doaj   +1 more source

Uncontrolled Generation Analysis and System Optimization of Permanent Magnet Synchronous Motor for Electric Vehicle

Xibei Gongye Daxue Xuebao, 2019
When a permanent magnet synchronous motor(PMSM) which is controlled by flux-weakening strategy rotates in high speed, the controller would send the turning-off signals to switch off all the transistors quickly if faults(e.g.

doaj   +1 more source

Study of the model experiment of blinding-hole UCG

Fuel Processing Technology, 2003
Abstract In order to meet the demand of recovering the “three unders” coal resources (under buildings, under railways, and under water bodies), the technique of blinding-hole underground coal gasification (UCG) is presented and its method is briefly explained in the paper.
openaire   +2 more sources

Investigation on Mechanical Behaviour of Coal and Overburden Rock for UCG

Proceedings, 2015
In recent years, the coupled UCG-CCS process has been considered as another potential CCS option, which can offer integrated energy recovery from coal and storage of CO2. However, existing potential problems may counteract its potential benefits. To develop a generic UCG-CCS site characterisation workflow, different aspects of this complex process ...
Shojai Kaveh, N. (author), Barnhoorn, A. (author), Wolf, K.H.A.A. (author)   +2 more
openaire   +3 more sources

Coal decarbonization: A state-of-the-art review of enhanced hydrogen production in underground coal gasification

Energy Reviews, 2022
The world is endowed with a tremendous amount of coal resources, which are unevenly distributed in a few nations. While sustainable energy resources are being developed and deployed, fossil fuels dominate the current world energy consumption.
Liangliang Jiang, Dan Xue, Zixiang Wei, Zhangxing Chen, Mammad Mirzayev, Yanpeng Chen, Shanshan Chen   +6 more
doaj  

Stochastic growth of quantum fluctuations during slow-roll inflation

, 2010
We compute the growth of the mean square of quantum fluctuations of test fields with small effective mass during a slowly changing, nearly de Sitter stage which took place in different inflationary models.
Finelli, F., Marozzi, G., Starobinsky, A. A., Vacca, G. P., Venturi, G.   +4 more
core   +3 more sources

Government Spending Under Non-Separability: a Theoretical Analysis [PDF]

In this paper we derive analytic implicit form conditions for the qualitative analysis of government spending multipliers and the optimal level of government spending in presence of non-separability between private and public components of aggregate ...
A. Palestini, L. Marattin
core  

Energy-Momentum Tensor of Cosmological Fluctuations during Inflation

, 2003
We study the renormalized energy-momentum tensor (EMT) of cosmological scalar fluctuations during the slow-rollover regime for chaotic inflation with a quadratic potential and find that it is characterized by a negative energy density which grows during ...
A. Tronconi, A. Vilenkin, A.A Starobinsky, A.A. Starobinsky, A.A. Starobinsky, A.A. Starobinsky, A.D. Linde, A.H. Guth, C.L. Bennett, D. Lyth, E. Stewart, F. Finelli, F. Finelli, F. Finelli, F. Finelli, F. Lucchin, G. Geshnizjani, G. Marozzi, G. P. Vacca, G. Rigopoulos, G. Venturi, H. Kodama, H. Noh, H.R. Lewis, Jr., H.V. Peiris, J. Maldacena, J. Martin, J.-c. Hwang, J.M. Stewart, L. Parker, L.R. Abramo, L.R. Abramo, L.R. Abramo, L.R. Abramo, M. Bruni, N.C. Tsamis, R. Abramo, R. Abramo, S. Habib, S. Habib, S.W. Hawking, V. Acquaviva, V.F. Mukhanov, V.F. Mukhanov, V.F. Mukhanov, V.F. Mukhanov, V.F. Mukhanov, Y. Nambu   +47 more
core   +1 more source

UCG Grammars; the Control of their Descriptive Adequacy

, 1989
International ...
Bès, Gabriel G., Jurie, Pierre-François   +1 more
openaire   +2 more sources

Use of an Institutional Personal Learning Environment to support learning actions in Higher Education

AtoZ: Novas Práticas em Informação e Conhecimento, 2016
Introduction: This paper presents a pilot experience on the use of an Institutional Personal Learning Environment (iPLE) which aimed to describe the conception, design and development of the iPLE, as well as to determine how users approached the iPLE ...
Lucila Pérez Cascante, Jesús Salinas, Victoria Marín   +2 more
doaj   +1 more source