Senin, 27 Januari 2014
A microburst often has high winds that can knock over fully grown trees. They usually last for a duration of a couple of seconds to several minutes.A distinction can be made between a wet microburst which consists of precipitation and a dry microburst which consists of virga.[3] They generally are formed by precipitation-cooled air rushing to the surface, but they perhaps also could be powered from the high speed winds of the jet stream deflected to the surface in a thunderstorm (see downburst). Microbursts are recognized as capable of generating wind speeds higher than 75 m/s (168 mph; 270 km/h).
There are a handful of factors that cause microbursts to develop, including mid-level dry air entrainment, cooling beneath the thunderstorm cloud base, sublimation (occurs when the cloud base is above the freezing level), and the existence of rain and/or hail within the thunderstorm (i.e. precipitation loading). Some microbursts are driven by a combination of these factors while others may only be driven by one factor. Due to this, microbursts can be subdivided into three primary types -- wet, dry, and hybrid. Cooling beneath the thunderstorm cloud base and sublimation are the primary forcing mechanisms with dry microbursts. Dry microbursts typically occur with very little precipitation at the surface or aloft, hence the dry type. Wet microbursts, on the other hand, are primarily driven by entrainment of mid-level dry air and precipitation loading. Hybrid microbursts possess characteristics of both wet and dry microbursts. They are forced in the mid-levels by dry air entrainment and/or precipitation loading and in the low-levels by cooling beneath the cloud base and/or sublimation.
Downbursts are a particular hazard to aircraft at low level, especially on take-off or landing. An aircraft approaching a downburst will first encounter a strong headwind, which will lead to an increase in indicated airspeed. When trying to fly a set airspeed on approach, a pilot might therefore be tempted to reduce power. This would be very dangerous because, as the aircraft passes thorough the downburst, the wind becomes a tailwind and the indicated airspeed and lift drops. The significant downward force of air in the downburst may be enough to force the aircraft into the ground or at least cause it to lose a significant amount of height. The subsequent loss of performance, as the aircraft encounters tailwinds, may cause further loss of height and be enough to cause the aircraft to stall. Once caught in a downburst, escape is only possible by flying straight ahead; whichever way an aircraft turns, it will encounter the tail winds and the associated performance impact. If the aircraft is in a turn at that point then the stalling speed will be higher, possibly making the situation worse.
1. The Aquarium needs cleaning.
2. He prefers sitting at the back of the class.
3. She recommended taking the train.
4. I remember telling her my phone number yesterday.
5. He admitted cheating on the test.
6. Tom avoided talking to her.
7. Andy can't stand her smoking in the office.
8. He completed renovating his house.
9. He denied committing the crime.
10. We enjoy swimming.
To-Invinitives
1. He began to chat.
2. He doesn't care to participate in the activity.
3. We decided to go to Yogya.
4. He failed to get a better score.
5. He hates to clean dishes.
6. We intend to visit you next month.
7. He managed to open the door without the key.
8. We plan to go to Europe this summer.
9. They prepared to take the test.
10. She waited to buy a movie ticket.
Minggu, 26 Januari 2014
Northern Lights
The bright dancing lights of the aurora are actually collisions between electrically charged particles from the sun that enter the earth's atmosphere. The lights are seen above the magnetic poles of the northern and southern hemispheres. They are known as 'Aurora borealis' in the north and 'Aurora australis' in the south..
Auroral displays appear in many colours although pale green and pink are the most common. Shades of red, yellow, green, blue, and violet have been reported. The lights appear in many forms from patches or scattered clouds of light to streamers, arcs, rippling curtains or shooting rays that light up the sky with an eerie glow.
What causes the Northern Lights?
The Northern Lights are actually the result of collisions between gaseous particles in the Earth's atmosphere with charged particles released from the sun's atmosphere. Variations in colour are due to the type of gas particles that are colliding. The most common auroral color, a pale yellowish-green, is produced by oxygen molecules located about 60 miles above the earth. Rare, all-red auroras are produced by high-altitude oxygen, at heights of up to 200 miles. Nitrogen produces blue or purplish-red aurora.
The connection between the Northern Lights and sunspot activity has been suspected since about 1880. Thanks to research conducted since the 1950's, we now know that electrons and protons from the sun are blown towards the earth on the 'solar wind'. (Note: 1957-58 was International Geophysical Year and the atmosphere was studied extensively with balloons, radar, rockets and satellites. Rocket research is still conducted by scientists at Poker Flats, a facility under the direction of the University of Alaska at Fairbanks - see web page http://www.gi.alaska.edu/
The temperature above the surface of the sun is millions of degrees Celsius. At this temperature, collisions between gas molecules are frequent and explosive. Free electrons and protons are thrown from the sun's atmosphere by the rotation of the sun and escape through holes in the magnetic field. Blown towards the earth by the solar wind, the charged particles are largely deflected by the earth's magnetic field. However, the earth's magnetic field is weaker at either pole and therefore some particles enter the earth's atmosphere and collide with gas particles. These collisions emit light that we perceive as the dancing lights of the north (and the south).
The lights of the Aurora generally extend from 80 kilometres (50 miles) to as high as 640 kilometres (400 miles) above the earth's surface.
Where is the best place to watch the Northern Lights?
Northern Lights can be seen in the northern or southern hemisphere, in an irregularly shaped oval centred over each magnetic pole. The lights are known as 'Aurora borealis' in the north and 'Aurora australis' in the south. Scientists have learned that in most instances northern and southern auroras are mirror-like images that occur at the same time, with similar shapes and colors.
Because the phenomena occurs near the magnetic poles, northern lights have been seen as far south as New Orleans in the western hemisphere, while similar locations in the east never experience the mysterious lights. However the best places to watch the lights (in North America) are in the northwestern parts of Canada, particularly the Yukon, Nunavut, Northwest Territories and Alaska. Auroral displays can also be seen over the southern tip of Greenland and Iceland, the northern coast of Norway and over the coastal waters north of Siberia. Southern auroras are not often seen as they are concentrated in a ring around Antarctica and the southern Indian Ocean.
Areas that are not subject to 'light pollution' are the best places to watch for the lights. Areas in the north, in smaller communities, tend to be best.
When is the best time to watch for auroral displays?
Researchers have also discovered that auroral activity is cyclic, peaking roughly every 11 years. The next peak period is 2013.
Winter in the north is generally a good season to view lights. The long periods of darkness and the frequency of clear nights provide many good opportunities to watch the auroral displays. Usually the best time of night (on clear nights) to watch for auroral displays is local midnight (adjust for differences caused by daylight savings time).
Legends of the Lights
'Aurora borealis', the lights of the northern hemisphere, means 'dawn of the north'. 'Aurora australis' means 'dawn of the south'. In Roman myths, Aurora was the goddess of the dawn. \par Many cultural groups have legends about the lights. In medieval times, the occurrences of auroral displays were seen as harbingers of war or famine. The Maori of New Zealand shared a belief with many northern people of Europe and North America that the lights were reflections from torches or campfires.
The Menominee Indians of Wisconsin believed that the lights indicated the location of manabai'wok (giants) who were the spirits of great hunters and fishermen. The Inuit of Alaska believed that the lights were the spirits of the animals they hunted: the seals, salmon, deer and beluga whales. Other aboriginal peoples believed that the lights were the spirits of their people.
Minggu, 19 Januari 2014
Istana Bogor has total area of 1.5 Hectare. The Building has 3 section, Center Building, Left Wing, and Side Wing. The center building used for formal goverment meeting and ceremony. The left wing has 6 bedroom.
The first location we going is the film room. It located at the right of the building. There we can see a movie room. There are a old proyector that placed inside the building. President Soekarno usually watch movies when he visited Istana Bogor with his colleague. In the left side of movie room, there is a minister meeting room. In the right side, there is a working room for President. In the work room, there are 2 paintings that is a national treasure for Uni Soviet (now it becomes Russia). That shows that the relationship between Jakarta and Moscow is very close. In the movie room, there also a painting from Basuki Abdullah, a famous artist in Indonesia.
Next, we going to the main room, the center building. There is a guest room to receive the diplomat from another country. The room was called "Lotus Room". This is the place where the other country President going. Next, there is a room that connecting the Lotus Room with the Main Room. This room is the center of Istana Bogor. The room also the "zero-kilometer point" of Bogor. If we go straight to the north from this building, we will arrive in the Presidential Palace in Jakarta. This room also famous for its treasure, "Cermin Seribu (a thousand mirror)." If we see to one of the mirror we can see many of our shadows, because the reflection. The main room is used for the meeting with other country's president.
Istana Bogor has many artifacts and art painting. There is a statue from the quarter of Moskow. The statue is originally sent from Moskow. Also, there is a woman statue named "Denok". The statue is made from a model that is from people around the palace. There are many other statues and paintings in the palace. Soekarno is an art lover. So, it looks like the palace also can be called as a art museum.
Pictures
In Front of Istana Bogor
Statue in Istana Bogor
Me and my family in the back of Istana Bogor
Istana Bogor from the back of Left Wing
Statue that was located in square in Moskow. Now its in the palace
Me and My Sister in front of the palace
(on the right) Statue of Marhaen, represent what happens when Indonesia has declared their proclamacy
Also, a art in Istana Bogor
Senin, 06 Januari 2014
I would be happy if I met my family
I would have been happy if I had met my family
2. I will be happy if I have holiday
I would be happy if I had holiday
I would have been happy if I had had holiday
3. I will be happy if I have finished all my task
I would be happy if I had finished all my task
I would have been happy if I had had finished all my task
4. I will be happy if I have plenty of money
I would be happy if I had plenty of money
I would have been happy if I had had plenty of money
5. I will be happy if I get high score in school
I would be happy if I got high score in school
I would have be happy if I had got high score in school
6. I will be happy if I have many friends
I would be happy if I had many friends
I would have been happy if I had had many friends
7. I will be happy if I can travel around the world
I would be happy if I could travel around the world
I would have been happy if I could have traveled around the world
8. I will be happy if I can go to the Moon
I would be happy if I could go to the Moon
I would have been happy if I could have gone to the Moon
9. I will be happy if I can get a scholarship
I would be happy if I could get a scholarship
I would have been happy if I could have got a scholarship
10. I will be happy if I have influence in the world
I would be happy if I had influence in the world
I would have been happy if I had had influence in the world
11. If I have 1 million dollars, I will invest my money
If I had 1 million dollars, I would invest my money
If I had had 1 million dollars, I would have invested my money
12. If I have 1 million dollars, I will go around Indonesia
If I had 1 million dollars, I would go around Indonesia
If I had had 1 million dollars, I would have gone around Indonesia
13. If I have 1 million dollars, I will buy company shares
If I had 1 million dollars, I would buy company shares
If I had had 1 million dollars, I would have bought company shares
14. If I have 1 million dollars, I will buy a house
If I had 1 million dollars, I would buy a house
If I had had 1 million dollars, I would have bought a house
15. If I have 1 million dollars, I will buy a car
If I had 1 million dollars, I would buy a car
If I had had 1 million dollars, I would have bought a car
16. If I have 1 million dollars, I will rent a plane
If I had 1 million dollars, I would rent a plane
If I had had 1 million dollars, I would have rent a plane
17. If I have 1 million dollars, I will buy some computer
If I had 1 million dollars, I would buy some computer
If I had had 1 million dollars, I would have bought some computer
18. If I have 1 million dollars, I will study abroad
If I had 1 million dollars, I would study abroad
If I had had 1 million dollars, I would have studied abroad
19. If I have 1 million dollars, I will make a robot
If I had 1 million dollars, I would make a robot
If I had had 1 million dollars, I would have made a robot
20. If I have 1 million dollars, I will do some charity
If I had 1 million dollars, I would do some charity
If I had had 1 million dollars, I would have done some charity
