网易公司1月18日宣布，正式加入国际开放课件联盟（OCWC），成为OCWC在中国唯一的企业联盟成员。这是继去年11月网易推出名校公开课项目以来，又一次在该领域发力。
网易加入OCWC之后，将共享OCWC全球所有名校课程资源。获得国际公开课会员资格以后，网易还将共享到更多高清高质量的开放课程，以及相关的课件PPT下载。网易名校公开课将秉承互联网开放、平等、协作、分享的精神，力求为爱学习的网友创造一个免费课程平台，让知识无国界。
除了网易公开课之外，其他门户网站也都开辟了类似的公开课网站。
网易公开课：http://v.163.com/open/
新浪公开课：http://edu.sina.com.cn/video/open/
搜狐公开课：http://tv.sohu.com/open/
中国联通定制的夏普3G手机应该可以插美国的sim卡在当地使用， 中国联通的手机大多没有网络锁， 反之美国的拿到中国就不一定能直接用了，美国营运商大多都设了网络锁！ GSM三频指850M 900M 1800M三个频率，中国不用850M北美地区才有，联通卡在美国可以用但漫游费太贵！
中国移动,中国联通,中国电信的3G频段分别是什么?
中国移动获得的频段是1880-1900MHz和2010-2025MHz； 中国电信获得的频段是1920-1935MHz和2110-2125MHz； 中国联通获得的频段是1940-1955MHz和2130-2145MHz。
中国移动、中国电信、中国联通的2G、3G分别采用哪些网络制式？分别是哪些号段？
移动 联通的 2G是GSM 电信的2G是CDMA
移动的3G td-cdma 联通的3G WCDMA 电信的3G CDMA2000
移动号段。134[0到9]。135、136、137、138、139、150、151、152、157、158、159、【187、188、147这几个属于3G专用号段】 电信 133 153 189 联通 130 131 132 156
Your small business ecommerce website is a valuable asset. Every hour that you spend adding content is an investment in your business, but it's an investment that could be wiped out in an instant. If that happens you could be faced with rebuilding your small business ecommerce website from scratch, and that's often such a daunting task that many business owners opt to walk away from the business instead.
In this column, I'll explain the risks, show you why ignorance is not an option, and how you can protect your investment in your small business website by ensuring that adequate data backup process are in place.
One slip of a finger by a disgruntled employee, or by your own carelessness, could delete your website. Your site's also at risk if the hard disk it's stored on crashes, or if the building that hosts your server is damaged by fire or natural disaster. And if the company that hosts your site goes out of business, well, you're pretty much out of luck there, too.
In any of these situations your website will go offline -- only the largest of businesses can afford to have a fully redundant system where a second machine in a different location can take over without significant delay. For most small business websites, a disaster will take your site offline for a substantial length of time if not for good.
If your site goes down for any reason, the question then becomes "How do you get it back online again?" If you have a recent data backup and if your programs are backed up then, with time, effort, expertise and dollars your website can be re-built and made fully operational again. It won't be easy but it is possible. However to do it, you need a backup, and it has to be a backup of everything. It has to be recent, and it has to be undamaged.
Whether or not you have what you need depends on who is doing your data backups, whether they're doing their job and if the backup they do includes everything that you need.
If you purchased a Web hosting service, and you're assuming your hosting service is attending to your data security needs, then that assumption could cost you your business. Ask your Web hosting service if it's performing regular backups. Ask what specifically its backing up, where the backups it stores and how many it keeps.
You also need to ask what sort of assistance will be available if you have to recover your site from those backups. If your hosting service cannot or won't answer these questions, you have cause for concern.
You need this information from your Web host provider because a backup to a duplicate drive on the same server won't save your website in the case of fire or natural disaster. At least one backup should be stored off site and well away from the server itself.
If your hosting service doesn't backup your shopping cart software and customizations, your product data and images, your email data, mailing lists and SSL certificates, then the absence of any one of these could cost you your business. For example, your email mailing list took years to build and, if you lose it, you won't be able to contact your customers. Your product details and images, sales data and historical record are all key parts of your website. If they aren't backed up, you won't be able to recreate them easily, if at all.
The number and frequency of the backups is important in case your system becomes corrupted or infected with a virus. If you have only backup, by the time you realize you have problems, it too might be corrupt or infected. Retaining a series of backups from different dates gives you a better chance of having a clean backup to restore from.
If your Web-hosting service goes out of business, not only will your website go down but you may not be able to access any backups that your hosting service made. To protect against this, you should have a second backup, which could be one you do yourself using a FTP (File Transfer Protocol) program to make a copy of your server files onto your own computers. There are also online services that will, for a fee, perform an online backup to copy your shopping cart and data to a second location that's not controlled by your hosting service.
Unfortunately, creating a data backup system and ensuring it works is something that's often left undone because it isn't a money earner. You won't see any immediate return from spending time organizing backups today, but tomorrow those backups could be the difference between being in business and not.
Smart business professionals don't go without data backup. To ensure you won't be kissing your small business ecommerce website goodbye if it crashes, make sure that it is backed up regularly, and that at least one backup copy is under your control.
Helen Bradley is a respected international journalist writing regularly for small business and computer publications in the USA, Canada, South Africa, UK and Australia. You can learn more about her at her Web site, HelenBradley.com
加拿大地区3G网络所使用的制式是什么啊？跟中国一样么？也是cdma？还是其他的？高手快来啊！
WCDMA和联通的一个样！
移动TD-SCDMA(TDD)： • 核心频段：1880~1920MHz，2010~2025MHz
• 补充频率：2300~2400MHz
联通WCDMA(FDD)：
• 核心频段：1920~1980MHz，2110~2170MHz(分别用于上行和下行)
• 补充频率：1755~1785MHz，1850~1880MHz(分别用于上行和下行)
电信CDMA2000(FDD)：
• 核心频段：825~835MHz，870~880MHz(分别用于上行和下行)
• 补充频率：885~915MHz，930~960MHz(分别用于上行和下行)
----------------------------------------
850/900/1800/1900这个是3G的频率吗？
不是。是传统GSM网络。
例如：
移动的GSM网络(FDD)：
GSM 900：
• 上行(移动台发，基站收)899~915MHz
• 下行(基站发，移动台收)944~960MHz
GSM 1800：
• 上行(移动台发，基站收)1710~1785MHz
• 下行(基站发，移动台收)1805~1880MHz
---------------------------------------------------------
Rogers 是加拿大最大的GSM无线电话商, 用的是GSM 850MHZ 和 GSM 1900 MHZ, FIDO 一年前已经被 ROGERS 收购, 用的是 GSM 1900MHZ. TELUS 和 BELL 都是 CDMA 网络, 手机没有 SIM 卡也没有 USM 卡的. 中国的手机如果要保证在加拿大能用至少要有 1900MHZ, 如果没有 850MHZ, 在地下停车场\隧道\电梯间会接收不到信号, 所以建议最好用四频手机. 中国的手机大多是两频或者三频, 低端手机里面四频的比较少见, 智能手机比如 HP iPAQ6515/6955 \Treo 650/750 Blackberry 7100/8700/8100/8800 HTC s620 都是四频的... 加拿大的 Rogers 不用 WCDMA/CDMA2000, Rogers 的 3.5G 手机是 HSDPA, 所以不要买中国或者香港的 3G 手机到这边用(用不上,浪费) 如果要用 email 的话建议买带有 Wifi (802.11 b/g) 的手机, 有急用的话在有免费wifi的地方就可以收发电邮 加拿大的本地手机很少有中文(不排除海外水货有), 所以不喜欢用英文机最好还是自己带. 加拿大的手机服务相对比较便宜, 一般接听免费(国内所谓的单向收费)的计划是 $25~35, 加上$6~8的牌照费, 911费, 来电显示费...一般月租在 $30~50, 如果签上3年的合同就可以拿商家送的手机 所谓的合同就是卖身契, 每个月用要给钱不用也要给钱是也. 如果签了最低的约, 比如$20每月, 加上杂费和税之后每月支出如果按照 $37算, 一年就是 $37 x 12 = $444, 三年就是 $1332. 如果不超支, 基本上就是那么多. 所以回头看送手机只不过是服务商的揽客手段之一.
09年最早出现在 Android 上，不久前登陆 iOS 平台的 Google Goggles 是一个非常有意思的应用，可以让你拍张照片就对里面的物体进行搜索，其最新版甚至还能帮你解开数独谜题。其实 Google 还隐藏了一个秘密：你所有在 Goggles 里面搜索过的图片 Google 都偷偷帮你记着呢，只要进入这个页面你就可以看到了。好心的 Google 还贴心的提供了 Remove Items 的功能，赶快把你搜索记录中见不得人的图片都删了吧。
另外可以想象的是，未来 Google Goggles 的搜索历史也会和 Web 搜索历史以及图片搜索等功能结合在一起，甚至允许用户直接在 Web 上直接提交 Goggles 搜索也说不定。
New sites have very little trust, no authority, few pages, and very little unique content. There is absolutely no way that new sites can get high levels of traffic from SEO or rank in the top-10 for high-volume and competitive searches. One your site is trusted, you can produce content and see your new pages in the top-10 or top-20 of Google search results withing a few days or less. Unfortunately for new sites, it takes much longer to achieve high rankings in search engines. New and untrusted sites without much authority must take to heart the old "it takes six months for SEO to work" approach.
Instead of hoping for immediate results, new sites must instead focus on making long-terms plans. There must be a plan to build trust and authority in their niche, consistently create optimized content, and a great overall product to which people will find it natural and helpful to link.
If you expect strong SEO traffic in the first 6 months of your site's existence, it is not going to be easy to accomplish. You may want to rethink your initial goals and lower the expectations from SEO until your site is trusted and has built up some authority.
New sites are given a little bit of trust by search engines, but the amount of trust new sites have is not enough to rank for any significant terms. Trust has to be built. There are a number of ways to make a search engine view your site as trustworthy. One such way is to maintain good practices of content creation. You must consistently create new content that is good enough to earn links on its own. We will touch on content creation in more detail a little later in the article.
Another great way to build trust is to get sites that are big and already trusted to link to your site. There are many types of trusted sites. Links from sites that belong to universities (.edu domains), non-profits (.org domains), or large companies can carry quite a bit of trust with them. In a search engine's mind, if a university (usually professor or student page) trusts you enough to link to you, then it is much more likely that your site can be trusted, and will likely rank higher.
Since at the beginning you will not be seeing much SEO traffic, but instead focusing on long-term plans to be an SEO giant, one great strategy is to become an authority in some niche. If you become an authority in a niche, you will earn links when other webmasters will need to link to credible sources and will link to you. When search engines see many consistent new links into a site, the search engines begin to think that this site has authority and authority is one of the biggest single determining factors in the rankings of pages within search results.
Unfortunately, if you are like most sites, you don't and won't have real authority. It is up to you to make this into a non-problem. You can mimic authority. One way to get many links into your site is to provide some widget or an embed tag that lives on other sites. Since every time someone uses your widget that is hosted on your site, it also creates a link to your site, over time this will create an appearance of authority when many sites link to you just by using your widget.
It isn't easy to get a widget or embedded content to become so popular that many sites will use it, but it is good to think about this early because if you do manage to create something that useful, it will pay off incredibly in the long run.
Content creation is a really important topic for all sites. There are three main considerations when creating an SEO-driven content creation strategy: 1) You must be as prolific as possible in your content creation. 2) You must balance the speed with which you create content with the highest possible quality of that content as possible. 3) You must also have an effective and cheap content promotion strategy beyond SEO, and a link-building strategy for the content you produce.
Since this article focuses on SEO, try to write content that is likely to attract links on its own. Such content is usually written to a high level of literacy, and is over at least 300 words per page (more is often better) of original content. If possible, the content should have a mechanism to keep itself fresh. That is done by letting the users control the content on a part of that page.
That way you have the high quality content you wrote yourself and another part of the page that is kept fresh by users who make your page have increasingly more content.
I probably should not have to say that your content should be original, but it must be repeated many times. Write original, compelling content. If you copy content, search engines will eventually detect that and will penalize you by removing your pages with copied content from the
search engine rankings all together.
This is obvious, but you have to focus on continuously building links into your site. There are a few strategies and guidelines that you should follow in order to not look suspicious. In general, your link creation should look as natural as possible to create the appearance though you earned these links without trying.
To make the links that come into your site look natural, aim for moderation in everything. For example, if you have many exchanged links (a situation where you link to a site that also links to you) that looks unnatural. But also, if you have no exchanged links it looks unnatural as well since it is pretty natural for sites in the same niche to link to each other and a little bit unusual if a site has no links to and from other similar sites.
When discussing link building into your site, there is also the dirty work called "link begging." It is one of the least attractive SEO practices, but it is necessary to some degree. What you do is email a few hundred respectable and highly reputable sites in your niche and politely ask if they would link to you. Depending on the quality of your site you will have a 1% to under 10% success rate. If you have a new, recently launched, or a somewhat non-professional looking site, expect to have a link begging success rate of very low single digit percent. But if the sites you email are reputable, the very few links you will get will go a very long way in helping you grow trust in the eyes of search engines. Often, a few great links is better than thousands of low-quality links.
Of course, there are a number of ways to make your link begging success rate rise, but that depends on your creativity, savvy, and resourcefulness. And of course, the biggest determining factor in your link begging efforts is the quality of your site and product. So as your site matures, people will take notice and be more willing to link to you.
Social media is not traditionally discussed in the same conversations as SEO, but that is changing. Google is now crawling tweets, and search engines are also developing other ways to determine whether a site is strong in social media, and using that as a factor in determining the overall quality of the site.
Just as links are a sign of popularity among websites, social bookmarks are signs of whether real people using the Web are showing signals of approval or indifference towards various pieces of content.
The important factor in considering social media when thinking about SEO is that there are no signs that the role of social media on the Web is declining. If anything, the Social Web is growing in prominence and in order to maintain search quality, search engines will need to pay attention to the social side of the Web. Additionally, actions of immediate friends are going to gain importance, so having a large social reach will likely reflect positively on SEO results.
Some of the easiest inbound links for a new site to get are ones where you also link to the person who is linking to you. It usually requires some communication between the webmasters of the two sites and an agreement to link to one another and make the links permanent.
Since it is difficult to obtain most links from coveted and trustworthy sites, it is easy to get carried away exchanging links with other new or unestablished sites just because of the comparative ease of obtaining the links in link exchanges.
Link exchanges are much less effective now than they used to be in the past, but they still work to a lower degree. A savvy link-exchange campaign can give you one of the best boosts when your site is still new just because many of the other methods of obtaining links are just too tough for new sites to pull off. When you do exchange links, only do so with sites in your niche that are reputable and trustworthy. Refrain from interlinking with other unestablished sites because more often than not you will just end up in bad link neighborhoods which can actually cause you SEO damage instead of benefit.
SEO is a strange field where there are often conflicting answers to many questions. One of the biggest points of confusion that many new site owners encounter is what their strategy should be for linking out to other sites.
Most new sites try to hoard the little amount of link juice that they have and not link out, but that is often a very limiting and unnatural approach. Since it is difficult for a new site to get other sites to even work with them, new site webmasters should feel very free and open about linking out (as long as those sites are of high quality) in an attempt to participate in as many initiatives as possible and to forge many relationships with as many people in their niche as possible.
Most of the time, a relationship is worth much more than a link. So if you review other prominent sites or just link to them and tell them about how much you like their sites and inform them of the link you posted, moving forward it might make them friendly towards you, and you will likely be able to count on many little favors from them along the way. That favor may come in many forms. It may be a link, a Facebook "like," or a powerful stumble or a an introduction to someone who can help your site.
The same linking philosophy is true when it comes to linking out to social networking sites or embedding interesting pieces of content from other sites into yours. While you don't want to go too far with linking out, if the link you may put on your site decidedly enhances the experience of your users, you should probably add that link. You should add such a link especially eagerly if it is to a reputable site.
To battle the link scarcity from the outside, you can do things within your site to create more links to your pages and get those pages ranking for various terms faster than they would if you had just waited.
You must have a strategy to interlink your internal pages. Content pages should link to other pages using the Wikipedia style within-content links. These are the most natural looking internal links, and will carry most weight. Second, you should have sections for related topics where you can add links to pages within your site which you would like to make more prominent. Third, you can have a table of contents section.
The table of contents within a content page creates links to that very same page. Here is an example of how to do this: In your table of contents section you can have links like I made on this Muir Woods Hiking page:
Take a look at the left side of that page after the navigation. There is a table of contents there. Each link in the table of contents goes to a section of that very same page. Here is an example of an HTML link for creating one of these table of contents links:
The subsection HTML also looks slightly different. Here is the example of the HTML for the actual subsection:
<a name="muir_woods_wildlife"><h2>Muir Woods Wildlife</h2></a> <a name="muir_woods_wildlife"><h2>Muir Woods Wildlife</h2></a> Take a look at how the Muir Woods page uses the in-text links to other pages, table of contents, and a related topics section to make the most out of the internal links it can have.Simply ranking in the top 10 or top 5 search results for competitive search terms can be very lucrative on its own. There are even numerous highly successful companies who do only one thing: rank pages in the top 10 for various competitive search terms. Yet for most companies, the effort that it takes to get into the top 10 is not worthwhile unless there are secondary goals.
Secondary goals may be to sell goods or services, or get people to make accounts on their sites, etc. A very important distinction that webmasters should always keep in mind is that some search terms may be highly converting (get the users to do what the webmaster wants them to do) and some search terms that seem like they should convert, do not.
Keeping with the example above with the hiking site, I had originally theorized that if I optimized the site for various hiking spots around the Bay Area (the site is a local for the San Francisco Bay Area) that people would convert into signed up users at a pretty high rate.
Once I got a number of pages ranking high for such terms, I was able to track that these users were actually not converting and not signing up. They just read about hiking at parks and left my site.
What gave me the best conversions were searches like "group hiking in San Francisco." That might be an obvious point since the site is about group hiking in the Bay Area, but there are just not that many such searches overall, so I could not rely on those searches alone.
So when you are embarking on a long-term SEO campaign, keep in mind what conversions you eventually want, and how to get them in a high-enough volume.
Also make sure that your site will actually be capable of ranking in a top-10 for some searches. Some high-volume search terms are very competitive and are nearly impossible to break into. You don't want to see your site stuck on the 3rd page of search results after months of trying to get it to rank.
Traditional SEO has mostly been centered about written content. Yet more and more the content on the Web is in video form rather than written in text. What some people do is make videos and maintain their own channel on YouTube that parallels their on-site content strategy. That way they can embed the video into their blog with their written text. This results in a fuller engagement of the users with the sites' brand.
From the blog, users can click on the video channel and then see the related videos in your channel, leading them to spend more time surfing content from your brand or site. This longer engagement of the user with your site often leads directly to higher levels of conversion. Additionally, many people believe that having text, photos and videos on your page makes the page appear more "interesting" in the eyes of search engines which see it as you offering more content to your users, and rank you higher since they perceive that as potentially being a higher quality page.
http://www.ubuntuhome.com/windows-and-ubuntu-install.html | Ubuntu Home Posted by Snow on 2012/06/25 安装Windows和Ubuntu双系统时，很多人喜欢先安装windows，然...
