The occurrence characteristics of sodium and its potential relationship with macerals in Zhundong coal, as well Shenfu coal average levels, are investigated this study. A new five-step sequential extraction method was first conducted for determination. status related samples determined by microscope SEM–EDS (scanning electron microscope–energy dispersive X-ray spectroscopy). Soluble salts (H2O-...

Organic matter (OM) in continental shale serves as both the source of oil and gas storage space unconventional petroleum systems. However, directly identifying types organic under SEM is challenging when simultaneously observing minerals pores. Kong2 Member(E2k2) Paleogene Cangdong sag Bohai Bay basin a typical layer China. Based on positioning observation technology combining field emission sc...

Many online content providers aim to compensate for a loss in advertising revenues by charging consumers for access to content. However, such a choice is not straightforward because subscription fees typically deter customers and a resulting decline in viewership further reduces advertising revenues. This research examines whether firms that offer both free and paid content can benefit from adj...

Dockets1 are traditional paper means for supporting speci c classes of work ows which concentrate on content and its value for individuals and organizations. A docket prescribes and nally documents some content reviewing process which is part of a larger value chain. Since contents represent essential investments they are carefully protected by principles like autonomy and ownership. However, v...

A content provider may join or leave a federation at any time and may be part of more than one federation at the same time. Content providers may also cease as organizations altogether, freeing their domain names for use by others. In addition, content identifiers are spread throughout the members of a federation. These identifiers are stored on various media, sometimes for long durations befor...

iron deficiency in soil reduces the quality of durum wheat leading to fe deficiency in human. thus, this experiment investigated the effects of foliar application of nano-iron oxide (2 and 4 g l-1), iron chelate (edta), (4 and 8 g l-1), iron sulfate (4 and 8 g l-1), and the control on grain yield and quality, yield components, chlorophyll and carotenoids contents, peroxidase (pox), catalase (ca...