哈密博爱宫颈炎(哈密男生勃起不硬挂什么科) (今日更新中)

LOS ANGELES, June 23 (Xinhua) -- The sun and its inner planets may have formed differently than previously thought, NASA's Jet Propulsion Laboratory (JPL) said on Thursday.Data revealed differences between the sun and planets in oxygen and nitrogen, which are two of the most abundant elements in our solar system, said JPL in Pasadena, Los Angeles.Although the difference is slight, the implications could help determine how our solar system evolved, JPL said.NASA researchers drew the conclusion after analyzing samples returned by NASA's 2004 Genesis mission, according to JPL.The air on Earth contains three different kinds of oxygen atoms which are differentiated by the number of neutrons they contain. Nearly 100 percent of oxygen atoms in the solar system are composed of O-16, but there are also tiny amounts of more exotic oxygen isotopes called O-17 and O-18. Researchers studying the oxygen of Genesis samples found that the percentage of O-16 in the sun is slightly higher than on Earth or on other terrestrial planets. The other isotopes' percentages were slightly lower."We found that Earth, the moon, as well as Martian and other meteorites which are samples of asteroids, have a lower concentration of the O-16 than does the sun," said Kevin McKeegan, a Genesis co-investigator from University of California, Los Angeles (UCLA) and the lead author of one of two papers published this week in Science journal. "The implication is that we did not form out of the same solar nebula materials that created the sun -- just how and why remains to be discovered." Another paper detailed differences between the sun and planets in the element nitrogen. Like oxygen, nitrogen has one isotope, N- 14, that makes up nearly 100 percent of the atoms in the solar system, but there is also a tiny amount of N-15. Researchers studying the same samples saw that when compared to Earth's atmosphere, nitrogen in the sun and Jupiter has slightly more N-14, but 40 percent less N-15. Both the sun and Jupiter appear to have the same nitrogen composition. As is the case for oxygen, Earth and the rest of the inner solar system are very different in nitrogen."These findings show that all solar system objects including the terrestrial planets, meteorites and comets are anomalous compared to the initial composition of the nebula from which the solar system formed," said Bernard Marty, a Genesis co- investigator from Petrographic and Geochemical Research Center in Fracne and the lead author of the other new Science paper. " Understanding the cause of such a heterogeneity will impact our view on the formation of the solar system."Data were obtained from analysis of samples Genesis collected from the solar wind, or material ejected from the outer portion of the sun. This material can be thought of as a fossil of our nebula because the preponderance of scientific evidence suggests that the outer layer of our sun has not changed measurably for billions of years."The sun houses more than 99 percent of the material currently in our solar system, so it's a good idea to get to know it better, " said Genesis Principal Investigator Don Burnett of the California Institute of Technology, Pasadena, California. "While it was more challenging than expected, we have answered some important questions, and like all successful missions, generated plenty more."Genesis was launched in August 2000. The spacecraft traveled to Earth's L1 Lagrange Point about one million miles from Earth, where it remained for 886 days between 2001 and 2004, passively collecting solar-wind samples.JPL managed the Genesis mission for NASA's Science Mission Directorate, Washington. The Genesis mission was part of the Discovery Program managed at NASA's Marshall Space Flight Center in Huntsville, Alasca.

RIO DE JANEIRO, Sept. 26 (Xinhua) -- Rio de Janeiro has the highest level of air pollution in Brazil, and is more polluted than many other world metropolis like New York, London and Paris, a World Health Organization (WHO) study said Monday.According to the study, which was carried out in 91 countries and regions, the air in Rio's metropolitan area contains 64 micrograms of fine particulate matter per cubic meter, over three times the upper limit set by the WHO, which is 20 micrograms per cubic meter.Despite being larger, having a bigger population and more vehicles, Sao Paulo's metropolitan area has less air pollution, with 38 micrograms of fine particulate matter per cubic meter.According to the WHO, "the largest contributors to urban outdoor air pollution include motor transport, small-scale manufacturers and other industries, burning of biomass and coal for cooking and heating, as well as coal-fired power plants." The organization said that residential wood and coal burning for heating also help increase air pollution, especially in rural areas in the cold months.The WHO expressed concern over air pollution levels in several cities, as some two million people worldwide die annually from conditions resulting from air pollution."Air pollution is a major environmental health issue, and it is vital that we increase efforts to reduce the health burden it creates," said Dr. Maria Neira, WHO's director for Public Health and Environment.According to the study, Ahwaz, Iran, has the most polluted air in the world, with 372 micrograms of fine particulate matter per cubic meter.

BEIJING, Aug. 27 (Xinhua) -- Heavy rain battered several east China provinces Saturday, destroying homes and farmlands, while drought persisted in some of the country's arid central and southwestern regions.On Friday and Saturday, five counties in Anhui Province were hit by downpour, the provincial meteorological bureau said.It said 23 towns reported over 200 mm of rainfall in the 24 hours from 8 a.m. Friday to 8 a.m. Saturday. In some villages of Huaiyuan County, the precipitation topped 300 mm, about one third of the annual average volume.In Fengtai County alone, 2,048 people were stranded by rain-triggered flood. As of 9 p.m. Saturday, about 800 of them were still waiting for evacuation.Incomplete statistics provided by the provincial government said 280 houses toppled in the rain disaster and another 580 homes were damaged. About 54,800 hectares of cropland was drowned by rain and flood.The direct economic loss was estimated at 240 million yuan (37.6 million U.S. dollars), the provincial government said Saturday night.The provincial weather bureau forecast heavy rain will continue in most parts of Anhui in the coming three days.Heavy rain also wreaked havoc in seven cities and counties of the eastern Shandong Province, causing 230 million yuan of direct economic losses.Torrential rain that lasted more than 24 hours from Friday to Saturday afternoon forced evacuation of nearly 2,000 people in parts of Zaozhuang, Liaocheng and Linyi cities, the provincial civil affairs department said.It said nearly 500 homes toppled and more than 800 others were damaged.China Meteorological Administration has forecast heavy rain in the coming three days in Anhui, Shandong, Liaoning, Jiangxi provinces and parts of the Xinjiang Uygur Autonomous Region in the coming two to three days.Little rain has been predicted, however, for the drought-hit provinces in central and southwestern China, the administration said on its website.While the predicted rainfall for Guizhou, Sichuan, Chongqing, Yunnan, Hunan and Guangxi averages only 2 to 8 mm in four days from Aug. 28 to 31, it said the high temperature in these areas will still hover over 35 degrees Celsius.Affected by the approaching Typhoon Nanmadol, the coastal areas of Guangdong Province will experience high tides Sunday, but the scorching weather will stay next week, the provincial weather bureau said.The high temperature in most parts of the province has topped 35 degrees Celsius.

XIAMEN, June 12 (Xinhua) -- Chinese mainland on Sunday announced a raft of measures on tourism, transportation, farmers and food safety to boost Taiwan's economic growth and cross-Strait relations.A pilot plan allowing mainlanders to visit Taiwan as individual tourists will start on June 28, which covers residents of Beijing, Shanghai and southeastern city of Xiamen at the first stage, said Wang Yi, head of the State Council's Taiwan Affairs Office.Wang told a conference at the weeklong Straits Forum being held in Xiamen of Fujian Province that the mainland and Taiwan also agreed to allow Fujian residents to visit the islands of Kinmen, Matsu and Penghu in the Taiwan Strait as individual tourists.Observers predict that the influx of mainland tourists will bring vitality to Taiwan's export-oriented economy which had greatly suffered from the global economic downturn.Currently, mainlanders are only allowed to visit Taiwan on package tours after the authorities lifted a partial ban in July 2008.At Sunday's conference, the two sides also announced to increase the number of cross-Strait passenger flights by more than 50 percent to 558 flights per week, and add terminals for the direct flights in four mainland cities, including one in northwestern city of Lanzhou, which brought the total number of cross-Strait flight terminals to 50 on both sides of the Strait.The moves aim to cope with the increasing number of mainlanders who wish to visit Taiwan.The number of mainland tourists traveling to the island reached 2.34 million as of the end of May, China's top tourism official said at the conference. There are also an increasing number of mainland business travelers and government delegations visiting Taiwan.Meanwhile, both sides agreed to "regulate airfares" for flights from Beijing and Shanghai to Taipei.Currently, the cheapest one-way ticket between Beijing and Taipei on Air China, the mainland's flagship carrier, costs around 1,300 yuan (about 200 U.S. dollars) while a full price one-way ticket costs more than 3,000 yuan, according to the airline's website.Some members of the public on both sides have complained about the high price.For the past decades, travelers had to transfer at other airports, particularly the one in Hong Kong, in order to reach Taiwan by air.In 2003, the two sides agreed to operate charter flights during Spring Festival, China's biggest public holiday.Regular direct flights across the Strait have been available since July 2008 to mainly serve mainland package tourists visiting Taiwan.The mainland also decided to facilitate entry and exit procedures for Taiwan residents and lower charges for endorsing their passports by 50 percent starting from July 1.Meanwhile, four "enterprising parks" will be set up in four cities of Fujian, central Henan and southwestern Guangxi provinces for Taiwan farmers launching agricultural startups on the mainland, said Wang Yi.Both sides also agreed to encourage mainland enterprises to purchase farm produce and other products listed in the early harvest program of the cross-Strait Economic Cooperation Framework Agreement (ECFA) directly in Taiwan.A general manager surnamed Lin of a farm produce company in Taiwan's southern city of Tainan said he hoped to seize the opportunity to benefit from the development of the island's farm and fishing sector as the mainland has become Taiwan's largest export market.Further, both sides agreed to strengthen cooperation and exchanges concerning nuclear power security and food safety.The third Straits Forum, which opened Saturday in Xiamen, facing Taiwan across the Strait, will close in the island's city of Taichung on Friday.

来源：资阳报