Fossil fuels can be used with minimal atmospheric emissions of carbon dioxide by capturing and storing the CO2 away in geologic structures. However, stored CO2 can leak back to the atmosphere reducing the utility of this technology. To explore the trade-offs between discounting, leakage, the cost of sequestration and the energy penalty (the energy necessary to capture, transport and inject carb...

In the near future, many sensors and terminals will be connected to the public network to provide various convenient IoT/M2M services. In order to connect many sensors to the network efficiently, wireless communication systems in the 920MHz band are seen as attractive solutions. We are focusing on the 920MHz band to research and develop highcapacity protocols that can accommodate many terminals...

The Bureau of Mines has s u c c e s s f u l l y used s u l f u r h e x a f l u o r i d e (SF,) a s a t r a c e r gas t o measure mine a i r f lows under c o n d i t i o n s where c o n v e n t i o n a l methods have f a i l e d . SF, was employed e x p e r i m e n t a l l y t o measure a c c u r a t e l y r e c i r c u l a t i o n o f r e t u r n i n t o i n t a k e a i r caused by leakage thro...

Carbon dioxide (CO2) sequestration is considered to be one of the most effective technologies mitigating greenhouse gas emissions. In this technology, single phase supercritical CO2 injected into an underground geological formation such as a deep saline aquifer. Existing projects demonstrate that successful implementations are possible; however, significant uncertainties associated with risks l...

A distributed system of protection and diagnostics of support structural elements of high-voltage power lines (HVPL) on 500 kV voltage was developed at Karaganda State technical university: current monitoring of leakage currents of bunches of suspension insulators; detection ice-rime depositions; cathode protection of underground elements of support constructions; information transfer from the ...

In this paper we address the problem of automatically detecting leakages in underground pipes of district heating networks from images captured by an airborne thermal camera. The basic idea is to classify each relevant image region as a leakage if its temperature exceeds a threshold. This simple approach yields a significant number of false positives. We propose to address this issue by machine...

Subsurface environment sensing and monitoring applications such as detection of water intrusion or a landslide, which could significantly change the physical properties of the host soil, can be accomplished using a novel concept, Wireless Signal Networks (WSiNs). The wireless signal networks take advantage of the variations of radio signal strength on the distributed underground sensor nodes of...

Abstract: In order to analyze the distribution rules and influence of stray current on subway rectangulartunneland subway Shield tunnel, threedimensional models were built separately. By changing the values of carry-current, ansys was used toanalyzeunder different geological conditions.Simulations show that the potential attenuation is nonlinear from the subway tunnel to the surrounding undergr...