As we all know, Beijing 2008 Olympic Sports Center is a big and beautiful bird's nest building, and the National Aquatics Center is a beautiful water cube full of bubbles. But what technologies are hidden under the behemoth? Today's essay on science and technology will lead you to unlock these buildings.

First, let's talk about the "Bird's Nest". Bird's nest architecture is based on the leading position of international architecture. It is a major breakthrough in the application of space technology in China and even the world, and it is also a major measure to apply space technology to building structural frames for the first time. It is a major project decided by many construction experts in China through feasibility verification and safety framework verification, so the Bird's Nest has become one of the main symbols of the 2008 Olympic Games in China. He will show the world a brand-new China.

First of all, in the design structure, the Bird's Nest, which uses space technology, introduces the demand for raw materials to the greatest extent, saves costs, and has a perfect and pure image, which is a highlight of the Olympic Games.

"Water Cube" and "Bird's Nest" embody China's harmonious cultural concept in the form of square buildings. The water cube steel structure adopts a new polyhedral space steel frame system based on bubble theory, which is the first at home and abroad and is a high-tech building. Structural design is facing many unprecedented problems at home and abroad. The final results will be directly applied to the design and construction of the National Swimming Center to ensure the safety, economy and rationality of the project, and will be incorporated into the new national grid structure technical regulations through the geometric composition and optimization research of the new spatial structure, the overall analysis and design of the structure, the ice and snow test of the structure, the calculation methods and tests of various nodes and components, the acousto-optic electrothermal research of the indoor environment, and the study of ETFE facade assembly system.

You know that the Water Cube and the Bird's Nest are both like this. I hope you can think more in your life and have a pair of innovative eyes. I believe you can also create some valuable ideas in the future.

Observe the growth process of corn.

Planting jade rice

It will be sunny on Thursday March 20th.

In today's science class, Miss Li came into the classroom with a bag of pink seeds and said with a smile, "Students, today we are going to plant corn in the experimental base." The teacher pushed his glasses up and said, "This kind of corn is different from other corn. Everything else is golden yellow, but the corn to be planted now is pink. "

"Why?" The students asked incredulously.

"That's a good question! In order to prevent insects from eating, this corn seed is mixed with pink insect repellent. "

Miss Li took us to the flower plantation, picked up a flowerpot and showed us how to grow corn. While doing this, he said, "There are three points to pay attention to when planting: First, loosen the soil; Second, don't insert the seeds too deep; The third is to wait for the seeds to be planted before soaking in water. "

It's our turn to do it ourselves. According to the teacher's method, I first covered a small tile on the hole at the bottom of the flowerpot, then knocked the mud into broken soil the size of beans and put it into the flowerpot, then gently inserted three corn seeds into the soil in the flowerpot (the smooth oval end is up and the flat end is down), and finally slowly dipped the flowerpot into water for a while to let the soil soak. When all this was done, we moved the flowerpot into the plastic shed according to Teacher Li's instructions.

In a class, the jars containing corn seeds were neatly arranged. Can it germinate? We are looking forward to ... (Wang)

(Comment: The author described the process of planting corn seeds in detail: covering holes-breaking ground-sowing-soaking in water-moving pots, and used some words to express the action appropriately. )

The seeds of Bai Weiling germinated.

It will be sunny on Friday March 28th.

At noon, the teacher said, "Now let's go to the greenhouse to see if the corn seeds we planted have sprouted."

We came to the greenhouse happily, "Wow, it's so hot!"

"It's really boring."

"This is a thermometer, 30 degrees!"

"No wonder it's so hot." ……

We chattered like birds.

"Come on, everyone, the corn seeds are sprouting!" I don't know who shouted, so we immediately ran to the flowerpot to see it. Really, some corn seeds have sprouted, and the buds have been pushed out of the soil like purple round columns. We measured it with a ruler. One centimeter tall, about half a centimeter tall, and some have not sprouted yet. The teacher said, "It will sprout in a few days."

After a while, we were all sweating, and some even unbuttoned our clothes. Seeing this, the teacher said, "Wait a few days to observe, and there will be greater gains next time." So, we all walked out of the greenhouse and prepared to observe again next time. (Yang Chen)

(Comments: In the exercise, I wrote the surprise of students seeing seeds germinate, and through discussion, I hinted at the temperature needed for seeds to germinate in the greenhouse. )

Bai Weiling is growing taller.

It will be fine on Monday, March 3 1 Sunday

The shadow of "stick" often appears in my mind. Have you grown up? Today we decided to see them again.

You can see a small piece of green in the distance, and the leaves are swaying gently under the breeze. The original "stick" disappeared and was replaced by thin and tender green leaves. We were really surprised and happy. The teacher told us that these are two real leaves. We squatted down and observed carefully, and saw that their stems were as thin as ballpoint pens, their skin was as purple as before, and the edges of their leaves were also purple. The big leaves outside wrap the small leaves inside, just like a mother holding a baby. The students all took out a ruler to measure its length. The longest leaf is six centimeters, about two centimeters wide, which is incredible.

"They have sprouted healthily in the greenhouse, so we have to let them go out to bask in the sun. Let's move the flowerpot outside the shed now. " The teacher ordered. We moved out the flowerpots one by one.

"Corn seeds grow so fast?" We can't help admiring. (Tian) according to

(Comment: The author can compare the thickness of corn seedling stem with the familiar ballpoint pen refill; Compare a big leaf wrapped in a small leaf to a mother holding a baby; The length and width of leaves are illustrated by specific numbers. These three methods accurately describe the observed corn growth. )

Bai Weiling Miao is thick and strong.

It will be fine on Tuesday, April 15.

I haven't cared about corn for more than half a month.

Before the writing class at noon, the teacher took us to observe the corn. So we happily followed the teacher to the garden area.

"Have you noticed any changes in the corn seedlings?"

"Growing taller."

"It's thicker than before."

"There are more and bigger leaves." Students have said.

"Look, white' thin lines' have emerged from the small hole under the flowerpot." I wonder who gave a cry. The students picked up the flowerpots one by one and looked up at the bottom of the flowerpots. They really saw a white silk thread sticking out.

We asked the teacher with these questions, and the teacher told us that the corn seedlings have grown up and grown very strong. That "white silk thread" is the root of corn seedlings. It seems that this flowerpot can't adapt to the growth of corn seedlings. We must build a new home for the corn seedling at once, so that it can grow freely and better. (Jiang Lu)

(Comment: This paper describes the growth of corn observed by myself through dialogue: it is tall, thick and leafy, especially the description of roots and whiskers, which is more exploratory. )

Give Yumimiao a new home.

It will be fine on Thursday, May 8th.

This afternoon, our class decided to give corn seedlings a new home.

Transplanting began, and we picked up the flowerpot and froze: how did you move the corn seedlings out? If you pull it, it will break the leaves; If I dig, I may pull out the root. At this time, I really didn't know what to do, so we rushed to the teacher and asked, "Teacher, how can we pull out the seedlings?" The teacher touched his head on purpose and said, "I don't know, find a way for yourself!" " "Just when I was scratching my head and couldn't figure out a way, we happened to see the old gardener in our school changing pots to grow flowers. So, we took a closer look: he raised his finger from the small hole at the bottom of the flowerpot, and a lump like a flowerpot emerged from the flowerpot. We tried, but the corn seedlings just wouldn't come out. At this time, we asked the old man what he could do. Grandpa found a small stick, clamped the tiles in the hole at the bottom of the flowerpot, and then pressed the flowerpot down. This method really worked, so we took the corn seedlings out of the flowerpot one by one like gardeners.

The teacher found another clearing, let's dig a hole. We stuck the shovel into the soil, pried it up and finally lifted it. In this way, we dug a shovel and a small hole. First, we carefully put the corn seedlings into the pit, then cover the soil flat. Finally, we picked up a small bucket and poured water on the corn seedlings. In this way, the transplanting of corn seedlings is completed.

We looked at the newly transplanted corn seedlings and said softly, "Corn seedlings, grow up quickly and grow big and sweet corn cobs for us to eat!" " "

(Zhu Muyun)

(Comment: The author's topic is very attractive to children and interesting. First write about the difficulties encountered in the process of transplantation, then ask the old gardener for advice, and finally write about the process of transplantation, which is very well written. )

Pick corn

It will be sunny on Friday, June 20th.

Today, the teacher said that we were going to break corn, and the students jumped three feet high with joy.

In the corn field, corn looks like a security guard from a distance, protecting the field. Look at those tall and thick corn carefully, just like the guards holding several shells.

The students ran around in the corn field, looking for the biggest breakthrough. The teacher said, "The corn with brown beard is not ripe yet. It will take a few days." I finally found my own plant and stared at a big, fat corn. I pressed the leaves down, holding the stalks in my left hand, twisting them down with my right hand, and then breaking them off.

Then, we began to peel the corn. It wore several thin layers of light green "clothes", just like a timid little girl wrapped herself up. I carefully took off one piece of "clothes" for it. The deeper I went, the thinner and more tender it became, and there were clusters of tender beards like fans inside. Ah! The beige corn grains are fresh and round, neatly arranged in several columns. It's so tempting that I can't wait to take a bite.

In a short time, we broke a bucket full of corn and looked at the harvested fruit. We can't tell you how happy we are. Miss Li gave us a sweet smile. (Zhuang Yu)

Enjoy a bumper harvest

It will be sunny on Friday, June 20th.

"Eat corn!" "Eat corn!" Everyone cheered.

The teacher came into the classroom with two baskets of steaming and delicious corn, which we just picked and cooked. We look like cats one by one. When we saw the fish, our mouths were watering, and we really wanted to take it away and eat it. Seeing that we couldn't wait, the teacher said, "How do we divide it?" "One for each person." "Take it with your eyes closed, don't pick it." Everyone has expressed their opinions.

We lined up in order to get them one by one, and some students touched one in the basket and left without hesitation; Some tossed and turned there, not knowing which one to choose; Others tilt their heads, close their eyes, choose left and right, put them in their hands, and finally make up their minds. It's my turn I wanted to pick a big one, but I didn't want to stand there and pick it slowly, so as not to affect others. Then I touched a thick one and left. When I opened my eyes, I saw orange corn kernels. What good luck.

I began to taste it. I have corn in my hand and stare at it. Although it is only a corn, it has poured my sweat for a semester. I hold it like a baby A Jin. With a gentle bite, corn seeds entered my mouth and were sweet to my heart. I am very happy, because I am no longer the little princess at home. I finally learned to work and tasted the fruits of my work ... "Why do you eat so little? I have already eaten half. " The deskmate reminded me that I suddenly realized and ate it. "Ah, so tender and delicious!"

All our classmates are enjoying the harvest with relish!

Chinese curriculum should be rooted in reality. It is necessary to broaden the field of Chinese learning and application, pay attention to interdisciplinary learning, and let students broaden their horizons, improve their learning efficiency and initially acquire the Chinese practical ability needed by modern society through the intersection, infiltration and integration of different contents and methods. "

This semester, the science class of our class carried out the practical activity of "planting corn". Therefore, I seized this opportunity to use the Chinese activity class, composition class, science class, comprehensive practical activities and school-based courses of science and technology education offered by our school to guide students to practice, observe, enrich composition materials, and cultivate students' ability to pay attention to the surrounding things and be willing to express in writing, thus writing a series of observation diaries of Planting Corn.