Learning bodyboarding...
作者:黄敏 日期:2009-12-28
Trip To Lakes Entrance
作者:黄敏 日期:2009-12-28
12月的小家伙们
作者:黄敏 日期:2009-12-28
[zt] Comparing Memory Allocation Methods
作者:黄敏 日期:2009-12-15
The following is a brief comparison of the various memory allocation methods:
- CoTaskMemAlloc
- GlobalAlloc
- HeapAlloc
- LocalAlloc
- malloc
- new
- VirtualAlloc
Although the GlobalAlloc, LocalAlloc, and HeapAlloc functions ultimately allocate memory from the same heap, each provides a slightly different set of functionality. For example, HeapAlloc can be instructed to raise an exception if memory could not be allocated, a capability not available with LocalAlloc. LocalAlloc supports allocation of handles which permit the underlying memory to be moved by a reallocation without changing the handle value, a capability not available with HeapAlloc.
[zt] TV antenna installation - 2
作者:黄敏 日期:2009-12-10
Tools
The majority of the tools and equipment you will need for most installations are apparent. The following is a list of useful tools and miscellaneous materials that might also come in handy.
1. A complete set of nut drivers (spin-tights).
2. A set of ratchets and sockets.
[zt] Install a TV Antenna
作者:黄敏 日期:2009-12-10
Before You Begin
Reconsider installing an antenna yourself. Be advised it's dangerous working on a roof especially near power lines. This project is best left to a professional antenna service.
Step-by-Step Instructions
Step 1: Read the manual
Carefully read the installation manual that came with the antenna and make sure you have all the hardware required.
Step 2: Assemble the antenna
Piece and fasten together the components of the two main boom sections moving any elements out of the way to connect cross over wires. Then loosely attach one of the mast clamp assemblies to the main boom. Attach the other mast clamp assembly to the cradle boom. It should face the same direction as the boom's mast assembly. Unfold the two sets of metal support straps on the cradle boom and attach them to the main boom. Press the end plugs into the main boom and cradle boom. Then pull the UHF bowtie's two halves away from the main boom until they lock into place. Slide each half's unattached end over one of the antenna's lead-in terminals (one for each half of the UHF bowtie on each side of the boom).
Step 3: Connect the lead-in cable to the antenna
Thread the transformer's spade terminals through the antenna's strain-relief tab. Slide the spade terminals around the antenna's lead-in terminals on both sides of the boom. Then secure them with fastening hardware. Screw the F-connector onto the matching transformer and slip the weather boot over the connection.
Step 4: Unfold the antenna
Hold the main boom's elements near the pivot points and pull them away from the boom until they snap into the self-locking plastic-support insulators. Hold each wing boom and turn its elements until they snap squarely in place and press the plugs into the wing booms. Bolt the wing boom brackets onto the main boom with fastening hardware. And insert the top and bottom wing booms into the brackets and secure them with fasteners.
Step 5: Install the antenna mount
Antenna mounts attach to the roof, chimney or side of the house. Follow the manufacturer's installation directions. If you use a roof mount cover the mounting screws with roofing cement to assure that there are no leaks.
To mount the antenna on a chimney it must be in good condition and at least a couple of feet above the peak of the roof. Mounts that attach to the side of the house should be attached with screws long enough to go through the siding into the underlayment or wall studs.
Step 6: Attach to the mast
Get help from someone who can hold the antenna on a ladder while you slide the antenna mast clamp assembly over the end of the mast and tighten to hold the antenna in place. Be careful not to let the crossover wires touch the antenna boom, mast or each other.
Step 7: Ground the antenna
The antenna and mount must be grounded. Aluminum grounding wire is available where you purchased the antenna. Purchase enough to lead from the antenna to the ground. This wire is clamped to the antenna mast at the top and to a ground rod driven into the earth at ground level. Carefully follow the grounding instructions that come with the antenna.
Lead the coax from the antenna to the location where you want it to enter the house. Install a 75-ohm grounding block on the siding and attach the end of the coax to the block. Drill a hole through the wall being careful not to hit wires or pipes that may be inside it. Run the second piece of coax through the wall and attach the end to the grounding block. Use a piece of grounding wire to attach the grounding block to the ground rod.
Step 8: Attach the antenna to the TV
You may have to purchase a splitter if you want to use the TV antenna as an antenna for the FM radio. The illustrations show several possible combinations. 
Illustrations courtesy of Radio Shack
网球心得：tennis tips - 2
作者:黄敏 日期:2009-12-09
- the ultimate target of pulling back the racket at preparation is the bottom end of the racket is pointing to the incoming ball. It may sound a bit extreme but I find it extremely important to achieve a smooth swing and great racket head speed.
