Monday, 18 June 2012
Sunday, 17 June 2012
Windows 8 Release Preview
Images ISO
L'image ISO doit être convertie en média d’installation que vous stockerez sur un DVD ou un disque mémoire flash USB. Vous trouverez la procédure à suivre sur cette page. Des outils de développement sont disponibles en téléchargement sur le Centre de développementWindows
Important : Si vous décidez de revenir au système d’exploitation précédent, vous devrez le réinstaller à l’aide des médias de récupération ou d’installation fournis avec votre PC, en général un DVD. Si vous ne disposez pas d'un média de récupération, vous pouvez en créer un à partir de la partition de récupération du PC en utilisant le logiciel fourni par le fabricant du PC. Pour plus d'informations, consultez la section de support technique sur le site Web du fabricant. Après l'installation de Windows 8, il est impossible de réinstaller la version précédente deWindows à l’aide de la partition de récupération du PC.
Monday, 11 June 2012
JKBench
DOWNHOLE DELAY mode
insert downhole delays in blast holes - detonators, connectors, primers
Edit Menu
Downhole delays are inserted into blast holes to detonate decks of explosives. A blast hole can contain more than one delay. At least one delay must be inserted in every group of explosive decks: if two or more adjoining decks are explosive materials, then only one delay located somewhere within the decks is required; however, if the explosive decks are separated by a non-explosive material, then a delay is required in each deck.
The main features of this mode are:
- insert detonators, connectors and primers
- insert at distance from toe or collar
- properties stored with design
Connectors are used to join a downhole detonator to the surface delay at the collar. The burn rate of the connector is taken into account when calculating the actual detonation time of the delay during detonation simulation. A primer can be included with the downhole delay, but it has no effect on the performance of the blast hole.
If the visibility option for downhole delays is turned on, the topmost delay is represented as a coloured triangle inside the blast hole.
Selecting a Delay
The Downhole Delays dialog is used to select a detonator, connector and primer and the position of the delay in the hole. Normally, items are selected from the JKBench series, but the display can be limited to a sub-set of created items. Click [Show Details] to display the properties of the selected item.
Distance
Two options are available to insert the delay at a position in a hole. Enter a distance for either option. If a [from collar] is selected, the delay will be placed at that depth down the hole; if [from toe] is selected, the delay will be placed at that distance measured up from the bottom of the hole. The final length of the connector is calculated as the depth of the delay from the collar. A set of conditions apply to the calculation of the depth:
- if the distance is greater than the length of the hole, the depth will be equal to the hole length
- if the distance is greater than the fixed length of the connector, the depth will be the length of the connector
- if [from toe] is selected and the holes are different lengths, then the depth of the delays will also vary in each hole
To insert the selected detonator, connector and primer in a single hole, place the cursor near the hole and click.
To insert the selected detonator, connector and primer in all holes, place the cursor anywhere in the design area and click.
To insert the selected detonator, connector and primer in marked holes, ensure that the holes are marked, then place the cursor anywhere in the design area and click.
To insert the selected detonator, connector and primer in unmarked holes, ensure that the holes are unmarked, then place the cursor anywhere in the design area and click.
Displays details of the data for the first delay in the nearest hole to the cursor. The hole is highlighted. To display the next delay in the same hole, click with the cursor on the hole, or click in the hole diagram. To select a different hole, move the cursor. For more information, go to Design Area: Query.
Delete all downhole delays from the design.
To delete a single delay, place the cursor near the hole and press [Backspace]. The topmost delay in the hole (closest to the collar) is removed. Repeat to remove the next delay in the same hole
Overview
JKBench is a program for the design and basic analysis of blasts in open cut mines. It allows the user to layout a blast design consisting of blast holes, decks, downhole and surface delays and connections, and then to run a detonation simulation. The design can be further described by strings and polygons. Basic analyses of volume, tonnage, powder factor, component and total costs can be calculated for the design.
 |  |  |  |
Although the design is created in 2D plan, all data is stored with full 3D coordinates (east, north, level) in a Microsoft Access database. Added to this are object details (such as hole dip, bearing, diameter, length, burden, spacing), properties of explosives, detonators, primers and connectors, plus timing information.
Program Features:
A blast design is divided into five component options, created in the various modes in the program. Each mode has specific tools and functions, with several global editing tools and reporting, query, input and output functions.
Area mode
|  |
Drill mode
|  |
Load mode
|  |
Down Hole Delays mode
|  |
Surface Delays mode
|  |
Detonate mode
|  |
Analysis tools
|  |
General tools
| |
Subscribe to:
Posts (Atom)