ISAPI Rewrite

Written by Pam Dean

Have you ever wanted to manage multiple domain names under a single account in IIS (Internet Information Services)? A common way to do this is to handle it from code. There are some disadvantages when handling this directly from code. Static pages aren't redirected, non-developers will need to purchase or dust off their programming books, and evidence remains that a redirection was done.

Along came ISAPI Rewrite to solve this issue. Running atrepparttar ISAPI level in IIS, this is done before any page or code is accessed so it works equally well on static and dynamic content. It overcomes allrepparttar 133384 objections mentioned above.

With common redirection code,repparttar 133385 user would see something like this:

Withrepparttar 133386 ISAPI Rewrite component,repparttar 133387 user will see this:

Even though behindrepparttar 133388 scenesrepparttar 133389 sites can be in completely different sub-folders,repparttar 133390 person visitingrepparttar 133391 website won't have any concept of this. They will simply seerepparttar 133392 clean domain names.

ISAPI Rewrite will rewrite (kind of like a redirect)repparttar 133393 user to a sub-folder even thoughrepparttar 133394 web browser doesn't realize this.

This is done very fast and efficiently and managed by a file called httpd.ini which should be placed inrepparttar 133395 root ofrepparttar 133396 site. It controls which domain names are handled by which sub-folder by utilizing different regular expression rules.

Some tips to remember when creatingrepparttar 133397 rules.

# is used to comment out a line

The following characters must be preceded by a "" to be recognized as a literal character ( meaning a character that represents itself)

Greasing Bearings - How Much is Enough?

Written by Thomas Yoon

Previously, we have talked about using suitable greases for different applications. Basically, we want to use low temperature greases for low temperature applications and high temperature greases for high temperature applications. The reason is quite simple - we wantrepparttar grease to form a thin film of lubricating oil betweenrepparttar 133383 rubbing surfaces.

If we use high temperature grease for normal temperature applications,repparttar 133384 chances arerepparttar 133385 grease will still be in semi-solid state and will not flow to coverrepparttar 133386 contact surfaces ofrepparttar 133387 moving components during operating conditions.

Assuming you have chosenrepparttar 133388 correct grease, how do you determine how much you need to put intorepparttar 133389 bearing?

Excessive grease lubrication can easily cause overheating. The grease gets churned around withinrepparttar 133390 moving parts ofrepparttar 133391 bearing and has nowhere to go. The temperature rises. The grease becomes repparttar 133392 wrong temperature selection even thoughrepparttar 133393 application is correct.

A general rule to follow is thatrepparttar 133394 bearing should be filled completely butrepparttar 133395 free space inrepparttar 133396 housing only partially. This gives room forrepparttar 133397 grease to be ejected fromrepparttar 133398 bearing on start-up.

However, there is some grease,repparttar 133399 so-called "totally-filled" greases like lithium soap greases that can allow filling up to 90% ofrepparttar 133400 free space inrepparttar 133401 housing, without risk of a temperature rise. This is because they are special. Their stability at high temperatures is excellent and can be utilized over a wider temperature range than sodium soap greases.

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