One of the main hazards occurring in post-mining areas is uncontrolled migration gases to surface, which may pose a serious threat life and health. These are mainly methane carbon dioxide, smaller amounts ethane higher hydrocarbons, oxide, hydrogen sulfide, radon. Methane migrating into lower levels buildings, garages, cable ducts, sewage systems reaching concentrations above 5% cause an explos...

Inspired by new technologies to monitor parking occupancy and process market signals, we aim expand the application of demand-responsive pricing in industry. Based on a graphical Hotelling model wherein each garage has information for its incoming demand, consider general competitive spatial systems under an asymmetric structure. We focus impact urban network structure incentive sharing. Our an...

The protection of reinforced concrete components exposed to chlorides is often ensured by coating systems, which are usually associated with high maintenance costs over the service life. A possible alternative use high-alloy, stainless steel reinforcement. Through smart selection in areas subject particularly stresses and possibility using mixed reinforcement black steel, this type can also be ...

context lumbar central spinal stenosis is common and often results in chronic persistent pain and disability, which can lead to multiple interventions. after the failure of conservative treatment, either surgical or nonsurgical modalities such as epidural injections are contemplated in the management of lumbar spinal stenosis. evidence acquisition recent randomized trials, systematic reviews an...

A nalysing, in 1997, the likely impact of electronic commerce is about as easy as estimating the impact of the automobile a hundred years ago. Intuitively you know that the impact will be large, but as yet few people know how to drive, roads are of varying quality and garages and mechanics are nearly non-existent. With some confidence you can say that there will be a beneficial effect on supply...

A “ nd as it came, it changed the face of America. Villages which had once prospered because they were ‘on the railroad’ languished with economic anemia; villages on Route 61 bloomed with garages, filling stations, hot-dog stands, chicken dinner restaurants, tearooms, tourists’ rests, camping sites, and affiuence. Slowly, but surely the age of steam was yielding to the gasoline age.’” That quot...

Spring flooding of the Red River of the North (RR) is common, but little information exits on how these flood events affect water and overbank sediment quality within an urban area. With the threat of the spring 2009 flood in the RR predicted to be the largest in recorded history and the concerns about the flooding of farmsteads, outbuildings, garages, and basements, the objectives of this stud...

In this study, an innovative and inexpensive approach, based on car engine air filters (CAFs), was used to monitor polycyclic aromatic hydrocarbons (PAHs) and heavy metals (HMs). CAFs were collected from two taxi garages in Guangzhou and analyzed for PAHs and heavy metals. The total concentrations of eight high molecular weight PAHs (ΣPAHs) ranged from 923 to 11378 μg/CAF. The average ΣPAHs con...

OBJECTIVE This paper describes the design characteristics of the National Heart, Lung, and Blood Institute (NHLBI)-funded studies that are testing innovative environmental interventions for weight control and obesity prevention at worksites. RESEARCH METHODS AND PROCEDURES Seven separate studies that have a total of 114 worksites ( approximately 48,000 employees) across studies are being cond...