During the northern hemisphere winter of 2003–2004 significant levels of stratospheric odd nitrogen (NOX) were observed descending from the mesosphere. Here we study subionospheric radio wave propagation data from Ny Ålesund, Svalbard, Norway to determine the origin of the mesospheric NOX. A clear change in the radio wave diurnal variation is observed, starting on January 13, 2004, lasting for 37 days. The behavior is consistent with the ionization, by Lyman-α, of thermospheric NOX descending into the mesosphere from altitudes above 90 km. Estimates of the concentration of NOX required to produce the observed ionization changes are consistent with the levels of previously published stratospheric mixing ratios after the NOX has descended into the stratosphere. The radio wave data shows that no significant proton or electron precipitation events into the mesosphere occurred at this time, and the mesospheric effects of the large storms in October/November 2003 had abated by late December 2003.
September 15th afternoon, focusing on Baidu promotion for years rumors, Baidu vice president Wang Zhan said today, had not paid the station closed event, a website was canceled included, mainly because the algorithm adjustment or cheating. He said that in the past six months, Baidu has hit 12 million 800 thousand false web.
only to take the way to improve the ranking of cheating site, will be canceled by Baidu included.
Baidu to take the bidding business model, not only to promote the rapid development of the search engine, but also led to a considerable degree of doubt. For example, do not promote the business model of opaque seal station, the money in the front row and so on.
pass for six or seven years, many people tend to believe in such things, but Wang Zhan said, "so many years no one is verified". Baidu even issued a new statement for this: Baidu has never been in the future will not be the purpose of Baidu to promote the sale of various types of websites to take the inappropriate behavior.
Wang Zhan said Baidu business promotion system and natural search system is completely independent of each other two systems, if a site is excluded from the search results, mainly in two aspects of the reasons. First, the search engine itself sorting algorithm updates, the search results will be optimized; in addition to the site is a way to cheat to try to improve the ranking or deceived by SEO.
for as long as willing to pay a high price, who can row first argument, Wang Zhan also denied. He said that Baidu’s ranking by the promotion of quality and quality of the two factors. The quality includes the correlation, the click rate, the creative writing level and the comprehensive performance of the account.
at the same time, it also involves the legitimacy of the audit and other links. According to reports, only about 35% of Baidu’s new contract customers in the first submission of resource files in line with the requirements of the system. The two sides also expressly agreed in the contract, even if the customer has to pay the first payment promotion fee, may also be because on the line in front of the final examination in the process of being rejected.
data show that the number of Baidu subscribers increased from 05 in to 412 thousand last year, the corresponding average customer input is also increased from $4300 per year to $19 thousand and 200 last year.
here, Baidu also announced in mid December last year to spend one hundred million yuan to start the sunshine action the latest developments. Data said that at present, the number of Baidu sunshine action to combat the number of fake Web has reached about 12 million 800 thousand, involving more than 1 million 300 thousand false site. Baidu also for the commercial promotion of screening and monitoring, tens of thousands of customers was rejected due to incomplete qualification.
also launched an internal code named "solar storm" action, to strengthen the special management of commercial information content in the promotion and combat, involving, finance, medicine and other fields. At present, the investigation and elimination of illegal drugs Baidu search keywords to achieve 1089, involving the number of drugs of 192 kinds, involving