I will start this treatise with a history of two major themes in data integration. In my opinion, the topic began with the major retailers in the 1990s consolidating their sales data into a data warehouse. To do this they needed to extract data from in-store sales systems, transform it into a predefined common representation (think of this as a global schema), and then load it into a data wareh...

In order to automate the scooping task, it is desirable that the resistive force acting on the bucket be obtained before the scooping is performed. The objective of this study is to derive theoretically the resistive forces acting on the bucket during scooping of piled rock fragments. First, the changes in the shape of the rock pile due to the penetration of it by the bucket are modeled. Based ...

To study the spatial distribution and scale of oil gas near faults in petroliferous basins, a prediction model is established for degree damage that different stages evolution exert on sealing ability mudstone cap rocks by calculating fault to rocks. This applied Nanpu 5th Structure results show at survey lines L2 L8, F1 Fault destroyed capacity rock 2nd member Dongying Formation (E3d2). The un...

Water jet technology is an effective measure by which to improve the efficiency of deep coalbed methane mining. Nevertheless, effect a water impinging on coal rock remains unclear. In this study, numerical simulation used analyze impingement drill test block, after experimental verification carried out. Next, basis that method feasible, influence factors in hole are analyzed. It concluded phase...

Solid materials such as rocks can contain primary defects, and internal defects are activated in the event of mining disturbance, which causes rock damage destruction. Therefore, it is great significance for engineering to study mechanical properties failure mechanism damaged rock. In this study, prefabricated crack sandstone specimens were prepared with cyclic loading-unloading test, uniaxial ...

The phenomenon of rock movement in mining areas has always been a difficult problem engineering, especially under complicated geological conditions. Although the backfilling method mitigates destruction surrounding rock, deformation can still exist area. In order to ensure safety under-sea mining, it is necessary study laws and mechanisms. This paper focuses on settlement analysis monitoring da...

The attractiveness of both ballistic missiles and weapons of mass destruction (WMD) to various actors throughout the world represents a serious threat to U.S. security. These weapons and delivery systems are popular in part because they are highly visible symbols of military prowess. As such, they provide significant influence on regional balances of power, even among friends and allies. Furthe...

Having personally witnessed the destruction at the World Trade Center on 11 September 2001, this paper presents my personal feelings and observations as an observer of both disaster and terror. Aside from the unimaginable horror as a result of the carnage, a feeling of helplessness was particularly prominent due to the inability to be able to care for casualties since most victims were fataliti...

The stability of the coal-rock composite structure is great significance to safety production deep mines, and different interface connection modes coal rock have an important influence on its stability. Therefore, following work was done in this article: Firstly, mechanical model established, analyzed. Secondly, characteristics (plastic zone, stress, displacement) under were studied by numerica...