1. 已知 $a_n = \frac{1}{2^{n-1}}$，求 $S_{20}$。
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THE UNIVERSITY DAILY KANSAN
MONDAY NOVEMBER 2, 2008
MONDAY NOVEMBER 2 2009
NEWS
3A
PRAIRIE (CONTINUED FROM 1A)
KU Environs is a student group dedicated to sustainability and promoting environmental education. Members of the group volunteered in the effort to preserve what's left of the prairie in Douglas County.
"The prairie is a unique resource we have, so we're doing our part to
keep it, said sara Schenk, Omaha, Neb, junior and secretary for Environs. "The prairie is part of Kansas history. We need to hang on to what little we have left."
In the 1850s, approximately 94
percent of Douglas County was covered in native prairie, according to a study on native prairie remnants released in 2005. As of 2005, only 0.5 percent of that prairie remained.
"The prairie is a unique resource we have, so we're doing our part to keep it."
SARA SCHENK Environs secretary
Kindscher said Kansas lost most of its native prairie to agriculture. He said preserving and restoring the prairie was important not only
Kelly Kindsher, senior scientist at the Kansas Biological Survey and co-author of the 2005 study, led the group of students to the site to collect the seeds. He said he would store the seeds in a refrigerator at the Kansas Biological Survey until April, when it came time to plant them.
to the history of Kansas, but to existing animals and plants that relied on the prairie habitat, such as the federally endangered mead's milkweed and the state bird, the meadowlark.
The Environs students braved the thorns and thistles of the native prairie, along with its resident, often large, spiders, for three hours to collect seeds in manila
Kelly Kindscher, senior scientist at the Kansas Biological Survey, demonstrates to a group, including members of KU Environs, how to extract seeds. Kindscher led the seed-gathering effort held at the Rockefeller Natural Prairie Saturday afternoon.
chickens to habitat loss and deg radiation, he said.
BRAVING THE PRAIRIE
"If we don't start
"If we don't start protecting the prairie and their habitat, we're going to see these species continue to decrease or even disappear," Kindscher said.
Chance Dibben/KANSAN
In this decade alone, Douglas County has lost all of its prairie
envelopes. Kindscher said the group collected seeds from about 30 species, a small but important fraction of the 200 species currently growing on the preserve.
Chelsea Paxson.
Newton junior,
searched amidst
grasses a full two feet taller than her to find rattlesnake masters — a waist-high plant known for its sharp, black thistles once used by the Fox Indians to keep rattlesnakes at bay, according to Kindscher.
Though the rattlesnake masters, as well as the season, prevented any rattlesnake sightings, they couldn't protect Paxson and her partner, Derek Glasgow, Winfield graduate student, from being cut by the thistles, despite the gloves they used to extract the seeds.
"The prairie isn't as showy as the rainforest, but it's just as important."
"The prairie is pretty, in its own way," Paxson said, pausing, "when you're not getting stabbed by everything in it."
EMILY LUBARSKY
Shawnee freshman
While they were feeling the pain of the rattlesnake masters, Emily Lubarsky, Shawnee freshman, collected Indian grass seeds — among the more popular and easily found plants on the prairie.
"It's an awesome opportunity for KU
students to get hands-on experience with the environment and form an attachment to a part of it that's endangered," Lubarsky said. "The prairie isn't as showy as the rainforest, but it's just as important."
Lubarsky partnered up with Shade Little, husband of Chancellor Gray-Little. He said he joined the students to experience a habitat had never seen before.
"It is a big part of us, even though we don't think about it," he said.
The seeds collected Saturday will be planted next April along a new cement path that winds its way through the native prairie. Although the trail would disrupt some of the habitat, Kindscher said, it would also allow the land to be more accessible to people for research, education and admiration.
And with native prairie lining the path, he said, people will get a closer look at the natural beauty this area once held.
— Edited by Abbey Strusz
Members of KU Enviros take part in a seed collecting at the Rockefeller Natural Prairie Saturday afternoon. The seeds will be planted in April as part of the effort to preserve the prairies.
INTERNATIONAL
Sink or swim? Ship passes test
World's largest cruise ship lowers smokestacks to pass under bridge
BY JAN M. OLSEN Associated Press
KORSOER, Denmark — The world's largest cruise ship cleared a crucial obstacle Sunday, lowering its smokestacks to squeeze under a bridge in Denmark.
The Oasis of the Seas — which rises about 20 stories high — passed below the Great Belt Fixed Link with a slim margin as it left the Baltic Sea on its maiden voyage to Florida.
Company officials are banking that its novelty will help guarantee its success. Five times larger than the Titanic, the $1.5 billion ship has seven neighborhoods, an ice rink, a small golf course and a 750-seat outdoor amphitheater. It has 2,700 cabins and can accommodate 6,300 passengers and 2,100 crew members.
Bridge operators said that even after lowering its telescopic smoke-stacks the giant ship had less than a 2-foot (half-meter) gap.
ASSOCIATED PRESS
ry suits with balconies overlooking the sea or promenades.
Accommodations include loft cabins, with floor-to-ceiling windows, and 1,600-square-foot luxu-
Hundreds of people gathered on beaches at both ends of the bridge, waiting for hours to watch the brightly lit behemoth sail by shortly after midnight (2300GMT; 7 p.m. EDT).
The liner also has four swimming pools, volleyball and basketball courts, and a youth zone with theme parks and nurseries for children.
Oasis of the Sea, nearly 40 percent larger than the industry's next-biggest ship, was conceived years before the economic downturn caused desperate cruise lines to slash prices to fill vacant berths.
"It was fantastic to see it glide under the bridge. Boy, it was big," said Kurt Hal, 56.
It was built by STX Finland for Royal Caribbean International and left the shipyard in Finland on Friday. Officials hadn't expected any problems in passing the Great Belt bridge, but traffic was stopped for about 15 minutes as a precaution when the ship approached, Danish navy spokesman Joergen Brand said.
The enormous ship features various "neighborhoods" — parks, squares and arenas with special themes. One of them will be a tropical environment, including palm trees and vines among the total 12,000 plants on board. They will be planted after the ship arrives in Fort Lauderdale.
The Oasis of The Seas, the world's largest cruise ship, clears a crucial obstacle, by lowering its smokestacks, to squeeze under a bridge in the Baltic Sea, Denmark Saturday. The Oasis of the Seas, which rises about 20 stories high, passed below the Great Belt Fixed Link with a slim margin as it left the Baltic Sea on Saturday on its maiden voyage to Florida. Five times larger than the Titanic, the ship has seven neighborhoods, an ice rink, a small golf course and a 750-seat outdoor amphitheatre.
Aboard the Oasis of the Seas, project manager Toivo Ilvonen of STX Finland confirmed that the ship had passed under the bridge without any incidents.
In the stern, a 750-seat outdoor
considered sacred because there are Native-American children buried there."
ECO (CONTINUED FROM 1A)
Demonstrators will hold signs, distribute fliers and encourage passers-by to sign a petition from 2 p.m. to 4
"Nothing fell off," he said.
STEPHANIE FARVE First Nations President
First Nations Student Association, a community organization for Native-American students.
senior, plans to attend the event.
Farve is president of the KU
"People just don't know the true history of Haskell and the true history of that area."
Farve is also a participant in the exchange
tru e history of that area," she said. "The Baker Wetlands are
p. m. today.
She said the wetlands held spiritual and historic significance for Native-American students at Haskell.
The petition will assert support for protection of the wildlife area, which contains more than 471 documented wildlife species.
program between the University and Haskell.
"People just don't know the true history of Haskell and the
- Edited by Brenna M. T. Daldorph
theater — modeled on an ancient Greek amphitheater — doubles as a swimming pool by day and an ocean front theater by night. The pool has a diving tower with spring boards and two 33-foot (10-meter) high-dive platforms. An indoor theater seats 1,300 guests.
One of the "neighborhoods," named Central Park, features a square with boutiques, restaurants and bars, including a bar that moves up and down three decks, allowing customers to get on and off at different levels.
Once home, the $1.5 billion floating extravaganza will have more, if less visible, obstacles to duck: a sagging U.S. economy, questions about the consumer appetite for luxury cruises and criticism that such sailing behemoths are damaging to the environment and diminish the experience of traveling.
It is due to make its U.S. debut on Nov. 20 at its home port, Port Everglades in Florida.
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