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初二物理课题研究报告

2023-07-17 20:32:18
TAG: 报告 物理
共3条回复
贝贝

我看你还是自己写,这个提高很快的。

给你点题目参考参考吧!

Problems for the 24th IYPT 2011

Set of references, questions and advices for 24th IYPT by Ilya Martchenko

1. Adhesive tape

Determine the force necessary to remove a piece of adhesive tape from a horizontal surface. Investigate the influence of relevant parameters.

2. Air drying

Table utensils (dishes, cutlery, etc.), after being washed, dry differently. Investigate how the time of drying depends on relevant parameters.

3. Bouncing flame

Place a flame (e.g. from a Bunsen burner) between two charged parallel metal plates. Investigate the motion of the flame.

4. Breaking spaghetti

Find the conditions under which dry spaghetti falling on a hard floor does not break.

5. Car

Build a model car powered by an engine using an elastic air-filled toy-balloon as the energy source. Determine how the distance travelled by the car depends on relevant parameters and maximize the efficiency of the car.

6. Convection

In a container filled with a liquid, heat transport will occur when the bottom of the container is heated and the top surface is cooled. How does the phenomenon change when the container rotates about its vertical axis?

7. Cup drum

A plastic cup is held upside-down and tapped on its base. Investigate the sound produced when the open end of the cup is above, on or below a water surface.

8. Domino amplifier

A row of dominoes falling in sequence after the first is displaced is a well known phenomenon. If a row of "dominoes" gradually increases in height, investigate how the energy transfer takes place and determine any limitations to the size of the dominoes.

9. Escaping powder

When a hot wire is plunged into a beaker of water with powder (e.g. lycopodium) floating on the surface, the powder moves rapidly. Investigate the parameters that alter the speed of movement of the powder.

10. Faraday heaping

When a container filled with small spheres (e.g. mustard seeds) is vibrated vertically with a frequency between 1 – 10 Hz, so called Faraday heaping occurs. Explore this phenomenon.

11. Fingerprints

Fill a glass with a liquid and hold it in your hands. If you look from above at the inner walls of the glass, you will notice that the only thing visible through the walls is a very bright and clear image of patterns on your fingertips. Study and explain this phenomenon.

12. Levitating spinner

A toy consists of a magnetic spinning top and a plate containing magnets (e.g. "Levitron"). The top may levitate above the magnetic plate. Under what conditions can one observe the phenomenon?

13. Light bulb

What is the ratio between the thermal energy and light energy emitted from a small electric bulb depending on the voltage applied to a bulb?

14. Moving cylinder

Place a sheet of paper on a horizontal table and put a cylindrical object (e.g. a pencil) on the paper. Pull the paper out. Observe and investigate the motion of the cylinder until it comes to rest.

15. Slow descent

Design and make a device, using one sheet of A4 80 gram per m2 paper that will take the longest possible time to fall to the ground through a vertical distance of 2.5m. A small amount of glue may be used. Investigate the influence of the relevant parameters.

16. Smoke stream

A glass jar is covered with cellophane. A tightly folded paper tube of length 4-5 cm is inserted hermetically into the jar through the cellophane cover. The tube is oriented horizontally. If one burns the outside end of the tube the dense smoke flows into the jar. Explore this phenomenon.

17. Vikings

According to a legend, Vikings were able to navigate in an ocean even during overcast (dull) weather using tourmaline crystals. Study how it is possible to navigate using a polarizing material. What is the accuracy of the method?

Problems for the 23rd IYPT

July 2010, Vienna, Austria

1. Electromagnetic cannon

A solenoid can be used to fire a small ball. A capacitor is used to energize the solenoid coil. Build a device with a capacitor charged to a maximum 50V. Investigate the relevant parameters and maximize the speed of the ball.

2. Brilliant pattern

Suspend a water drop at the lower end of a vertical pipe. Illuminate the drop using a laser pointer and observe the pattern created on a screen. Study and explain the structure of the pattern.

3. Steel balls

Colliding two large steel balls with a thin sheet of material (e.g. paper) in between may “burn” a hole in the sheet. Investigate this effect for various materials.

4. Soap film

Create a soap film in a circular wire loop. The soap film deforms when a charged body is placed next to it. Investigate how the shape of the soap film depends on the position and nature of the charge.

5. Grid

A plastic grid covers the open end of a cylindrical vessel containing water. The grid is covered and the vesel is turned upside down. What is the maximum size of holes in the grid so that water does not flow out when the cover is removed?

6. Ice

A wire with weights attached to each end is placed across a block of ice. The wire may pass through the ice without cutting it. Investigate the phenomenon.

7. Two flasks

Two similar flasks (one is empty, one contains water) are each connected by flexible pipes to a lower water reservoir. The flasks are heated to 100℃ and this temperature is held for some time. Heating is stopped and as the flasks cool down, water is drawn up the tubes. Investigate and describe in which tube the water goes up faster and in which the final height is greater. How does this effect depend on the time of heating?

8. Liquid light guide

A transparent vessel is filled with a liquid (e.g. water). A jet flows out of the vessel. A light source is placed so that a horizontal beam enters the liquid jet (see picture). Under what conditions does the jet operate like a light guide?

9. Sticky water

When a horizontal cylinder is placed in a vertical steam of water, the stream can follow the cylinder"s circumference along the bottom and continue up the other side before it detaches. Explain this phenomenon and investigate the relevant parameters.

10. Calm surface

When wind blows across a water surface, waves can be observed. If the water is covered by an oil layer, the waves on the water surface will diminish. Investigate the phenomenon.

11. Sand

Dry sand is rather ‘soft"to walk on when compared to damp sand. However sand containing a significant amount of water becomes soft again. Investigate the parameters that affect the softness of sand.

12. Wet towels

When a wet towel is flicked, it may create a cracking sound like a whip. Investigate the effect. Why does a wet towel crack louder than a dry one?

13. Shrieking rod

A metal rod is held between two fingers and hit. Investigate how the sound produced depends on the position of holding and hitting the rod?

14. Magnetic spring

Two magnets are arranged on top of each other such that one of them is fixed and the other one can move vertically. Investigate oscillations of magnet.

15. Paper anemometer

When thin strips of paper are placed in an air flow, a noise may be heard. Investigate how the velocity of the air flow can be deduced from this noise?

16. Rotating spring

A helical spring is rotated about one of its ends around a vertical axis. Investigate the expansion of the spring with and without an additional mass attached to its free end.

17. Kelvin"s dropper

Construct Kelvin"s dropper. Measure the highest voltage it can produce. Investigate its dependence on relevant parameters.

自己从里面选比较有趣的玩吧!

做个试验杜对于自己的提高是很大的。这些不少是给高中生的,但是初中生可以定性的解释也很不错。比如6. Ice

A wire with weights attached to each end is placed across a block of ice. The wire may pass through the ice without cutting it. Investigate the phenomenon.

这题网上有台湾小朋友做的确实很不错,虽然理论不足,但是试验做的和在PRL和Nature上做的本质完全一致。

cloud123

我看你还是自己写,这个提高很快的。

给你点题目参考参考吧!

Problems for the 24th IYPT 2011

Set of references, questions and advices for 24th IYPT by Ilya Martchenko

1. Adhesive tape

Determine the force necessary to remove a piece of adhesive tape from a horizontal surface. Investigate the influence of relevant parameters.

2. Air drying

Table utensils (dishes, cutlery, etc.), after being washed, dry differently. Investigate how the time of drying depends on relevant parameters.

3. Bouncing flame

Place a flame (e.g. from a Bunsen burner) between two charged parallel metal plates. Investigate the motion of the flame.

4. Breaking spaghetti

Find the conditions under which dry spaghetti falling on a hard floor does not break.

5. Car

Build a model car powered by an engine using an elastic air-filled toy-balloon as the energy source. Determine how the distance travelled by the car depends on relevant parameters and maximize the efficiency of the car.

6. Convection

In a container filled with a liquid, heat transport will occur when the bottom of the container is heated and the top surface is cooled. How does the phenomenon change when the container rotates about its vertical axis?

7. Cup drum

A plastic cup is held upside-down and tapped on its base. Investigate the sound produced when the open end of the cup is above, on or below a water surface.

8. Domino amplifier

A row of dominoes falling in sequence after the first is displaced is a well known phenomenon. If a row of "dominoes" gradually increases in height, investigate how the energy transfer takes place and determine any limitations to the size of the dominoes.

9. Escaping powder

When a hot wire is plunged into a beaker of water with powder (e.g. lycopodium) floating on the surface, the powder moves rapidly. Investigate the parameters that alter the speed of movement of the powder.

10. Faraday heaping

When a container filled with small spheres (e.g. mustard seeds) is vibrated vertically with a frequency between 1 – 10 Hz, so called Faraday heaping occurs. Explore this phenomenon.

11. Fingerprints

Fill a glass with a liquid and hold it in your hands. If you look from above at the inner walls of the glass, you will notice that the only thing visible through the walls is a very bright and clear image of patterns on your fingertips. Study and explain this phenomenon.

12. Levitating spinner

A toy consists of a magnetic spinning top and a plate containing magnets (e.g. "Levitron"). The top may levitate above the magnetic plate. Under what conditions can one observe the phenomenon?

13. Light bulb

What is the ratio between the thermal energy and light energy emitted from a small electric bulb depending on the voltage applied to a bulb?

14. Moving cylinder

Place a sheet of paper on a horizontal table and put a cylindrical object (e.g. a pencil) on the paper. Pull the paper out. Observe and investigate the motion of the cylinder until it comes to rest.

15. Slow descent

Design and make a device, using one sheet of A4 80 gram per m2 paper that will take the longest possible time to fall to the ground through a vertical distance of 2.5m. A small amount of glue may be used. Investigate the influence of the relevant parameters.

16. Smoke stream

A glass jar is covered with cellophane. A tightly folded paper tube of length 4-5 cm is inserted hermetically into the jar through the cellophane cover. The tube is oriented horizontally. If one burns the outside end of the tube the dense smoke flows into the jar. Explore this phenomenon.

17. Vikings

According to a legend, Vikings were able to navigate in an ocean even during overcast (dull) weather using tourmaline crystals. Study how it is possible to navigate using a polarizing material. What is the accuracy of the method?

Problems for the 23rd IYPT

July 2010, Vienna, Austria

1. Electromagnetic cannon

A solenoid can be used to fire a small ball. A capacitor is used to energize the solenoid coil. Build a device with a capacitor charged to a maximum 50V. Investigate the relevant parameters and maximize the speed of the ball.

2. Brilliant pattern

Suspend a water drop at the lower end of a vertical pipe. Illuminate the drop using a laser pointer and observe the pattern created on a screen. Study and explain the structure of the pattern.

3. Steel balls

Colliding two large steel balls with a thin sheet of material (e.g. paper) in between may “burn” a hole in the sheet. Investigate this effect for various materials.

4. Soap film

Create a soap film in a circular wire loop. The soap film deforms when a charged body is placed next to it. Investigate how the shape of the soap film depends on the position and nature of the charge.

5. Grid

A plastic grid covers the open end of a cylindrical vessel containing water. The grid is covered and the vesel is turned upside down. What is the maximum size of holes in the grid so that water does not flow out when the cover is removed?

6. Ice

A wire with weights attached to each end is placed across a block of ice. The wire may pass through the ice without cutting it. Investigate the phenomenon.

7. Two flasks

Two similar flasks (one is empty, one contains water) are each connected by flexible pipes to a lower water reservoir. The flasks are heated to 100℃ and this temperature is held for some time. Heating is stopped and as the flasks cool down, water is drawn up the tubes. Investigate and describe in which tube the water goes up faster and in which the final height is greater. How does this effect depend on the time of heating?

8. Liquid light guide

A transparent vessel is filled with a liquid (e.g. water). A jet flows out of the vessel. A light source is placed so that a horizontal beam enters the liquid jet (see picture). Under what conditions does the jet operate like a light guide?

9. Sticky water

When a horizontal cylinder is placed in a vertical steam of water, the stream can follow the cylinder"s circumference along the bottom and continue up the other side before it detaches. Explain this phenomenon and investigate the relevant parameters.

10. Calm surface

When wind blows across a water surface, waves can be observed. If the water is covered by an oil layer, the waves on the water surface will diminish. Investigate the phenomenon.

11. Sand

Dry sand is rather ‘soft"to walk on when compared to damp sand. However sand containing a significant amount of water becomes soft again. Investigate the parameters that affect the softness of sand.

12. Wet towels

When a wet towel is flicked, it may create a cracking sound like a whip. Investigate the effect. Why does a wet towel crack louder than a dry one?

13. Shrieking rod

A metal rod is held between two fingers and hit. Investigate how the sound produced depends on the position of holding and hitting the rod?

14. Magnetic spring

Two magnets are arranged on top of each other such that one of them is fixed and the other one can move vertically. Investigate oscillations of magnet.

15. Paper anemometer

When thin strips of paper are placed in an air flow, a noise may be heard. Investigate how the velocity of the air flow can be deduced from this noise?

16. Rotating spring

A helical spring is rotated about one of its ends around a vertical axis. Investigate the expansion of the spring with and without an additional mass attached to its free end.

17. Kelvin"s dropper

Construct Kelvin"s dropper. Measure the highest voltage it can produce. Investigate its A wire with weights attached to each end is placed across a block of ice. The wire may pass through the ice without cutting it. Investigate the phenomenon.

这题网上有台湾小朋友做的确实很不错,虽然理论不足,但是试验做的和在PRL和Nature上做的本质完全一致。

nicehost

百度一下~

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2023-07-17 12:35:054

风速计的应用是什么?

在管道内气流流速测量实践证明风速计的16mm的探头用途最广。其尺寸大小既保证了良好的通透性,又能承受更高达60m/s的流速。管道内气流流速测量作为可行的测量方法之一,间接测量规程(栅极测量法)适用空气测量。抽气排气中的测量通气口会极大的变管道内气流相对均衡的分布状态:在自由通气口表面产生高速区,其余部位为低速区,并在栅格上产生旋涡。根据栅格的不同设计方式,在栅格前一定距离处(约500px),气流截面较为稳定。在这种情况下,通常采用大风速计的口径转轮进行测量。因为较大的口径能够对不均衡的流速进行平均,并在较大范围内计算其平均值。
2023-07-17 12:35:292

请教:什么是测量风速的仪器?谢谢!

测量风速的仪器叫做风速计(anemometer)。气象台站最常用的为风杯风速计,它由3个互成120°固定在支架上的抛物 锥空杯组成感应部分,空杯的凹面都顺向一个方向。整个感应部分安装在一根垂直旋转轴上,在风力的作用下,风杯绕轴以正比于风速的转速旋转。另一种旋转式风速计为旋桨式风速计,由一个三叶或四叶螺旋桨组成感应部分,将其安装在一个风向标的前端,使它随时对准风的来向。桨叶绕水平轴以正比于风速的转速旋转。
2023-07-17 12:35:564

风速仪的原理还有风速仪如何使用?

1、风速仪的原理:风速计其基本原理是将一根细的金属丝放在流体中,通电流加热金属丝,使其温度高于流体的温度,因此将金属丝风速计称为“热线”。当流体沿垂直方向流过金属丝时,将带走金属丝的一部分热量,使金属丝温度下降。根据强迫对流热交换理论,可导出热线散失的热量Q与流体的速度v之间存在关系式。金属丝通常用铂、铑、钨等熔点高、延展性好的金属制成。常用的丝直径为5μm,长为2 mm,最小的探头直径仅1μm,长为0.2 mm。根据不同的用途,热线探头还做成双丝、三丝、斜丝及V形、X形等。为了增加强度,有时用金属膜代替金属丝,通常在一热绝缘的基体上喷镀一层薄金属膜,称为热膜探头。热线探头在使用前必须进行校准。静态校准是在专门的标准风洞里进行的,测量流速与输出电压之间的关系并画成标准曲线,动态校准是在已知的脉动流场中进行的,或在风速仪加热电路中加上一脉动电信号,校验热线风速仪的频率响应,若频率响应不佳可用相应的补偿线路加以改善。0至100m/s的流速测量范围可以分为三个区段:低速:0至5m/s;中速:5至40m/s;高速:40至100m/s。风速仪的热敏式探头用于0至5m/s的精确测量,风速仪的转轮式探头测量5至40m/s的流速效果最理想。而利用皮托管则可在高速范围内得到最佳结果。正确选择风速仪的流速探头的一个附加标准是温度,通常风速仪的热敏式传感器的使用温度约达+-70C。特制风速仪的转轮探头可达350C。皮托管用于+350C以上。2、风速仪使用方法:1)使用前观察电表的指针是否指于零点,如有偏移,可轻轻调整电表的机械调整螺丝,使指针回到零点。2)将校正开关置于断的位置。3)将测杆插头插在插座上,测杆垂直向上放置,螺塞压紧使探头密封,“校正开关”置于满度位置,慢慢调整“满度调节”旋纽,使电表指针指在满度位置。4)将“校正开关”置于“零位”,慢慢调整“粗调”、“细调”两个旋纽,使电表指针指在零点的位置。5)经以上步骤后,轻轻拉动螺塞,使测杆探头露出(长短可根据需要选择),并使探头上的红点面对对着风向,根据电表度读数,查阅校正曲线,即可查出被测风速。6)在测定若干分后(10min左右),必须重复以上3、4步骤一次,使仪表内的电流得到标准化。7)测毕,应将“校正开关”置于断的位置。
2023-07-17 12:36:252

11个字母的英文单词

  11个字母组成的英文,你知道有哪些吗?知道它们有多少吗?下面是我给大家整理的11个字母的英文单词,供大家参阅!   11个字母的英文单词1   1. aniseikonia   2. aniseikonic   3. anisogamies   4. anisogamous   5. anisotropic   6. ankylosaurs   7. annexations   8. annihilated   9. annihilates   10. annihilator   11. anniversary   12. annotations   13. annualizing   14. annulations   15. annunciated   16. annunciates   17. annunciator   18. anodization   19. anointments   20. anomalously   21. anonymities   22. anonymously   23. anophelines   24. anorthosite   25. anovulatory   26. antagonisms   27. antagonists   28. antagonized   29. antagonizes   30. antecedence   31. antecedents   32. antecessors   33. antechamber   34. antechapels   35. antenatally   36. antenuptial   37. antependium   38. antepenults   39. anteverting   40. antheridial   41. antheridium   42. anthocyanin   43. anthologies   44. anthologist   45. anthologize   46. anthracenes   47. anthracites   48. anthracitic   49. anthracnose   50. anthropical   11个字母的英文单词2   1. anthropoids   2. antialcohol   3. antianxiety   4. antibaryons   5. antibiotics   6. antiboycott   7. antiburglar   8. anticathode   9. anticipants   10. anticipated   11. anticipates   12. anticipator   13. anticruelty   14. anticyclone   15. antidotally   16. antidumping   17. antielitism   18. antielitist   19. antiemetics   20. antifascism   21. antifascist   22. antifashion   23. antifatigue   24. antifoaming   25. antifogging   26. antiforeign   27. antifouling   28. antifreezes   29. antifungals   30. antigravity   31. antiheroine   32. antihunting   33. antijamming   34. antileprosy   35. antileptons   36. antiliberal   37. antilogical   38. antimalaria   39. antimatters   40. antimissile   41. antimitotic   42. antimoderns   43. antimonials   44. antimonides   45. antimusical   46. antinatural   47. antinatures   48. antineutron   49. antinomians   50. antinuclear   11个字母的英文单词3   1. anastomoses   2. anastomosis   3. anastomotic   4. anastrophes   5. anatomising   6. anatomizing   7. ancestoring   8. ancestrally   9. anchoresses   10. anchorwoman   11. anchorwomen   12. anchovettas   13. ancientness   14. ancientries   15. ancillaries   16. andalusites   17. androgynies   18. androgynous   19. anecdotages   20. anecdotally   21. anecdotical   22. anecdotists   23. anemographs   24. anemometers   25. anencephaly   26. anesthesias   27. anesthetics   28. anesthetist   29. anesthetize   30. anfractuous   31. angelfishes   32. angelically   33. angiography   34. angiomatous   35. angioplasty   36. angiosperms   37. angiotensin   38. anglicising   39. anglicizing   40. angrinesses   41. angulations   42. anilinguses   43. animadverts   44. animalcules   45. animalculum   46. animalistic   47. animalities   48. animalizing   49. animateness   50. animosities   
2023-07-17 12:36:341

怎样保障英国ROSE动态腭电图仪使用客户的合法权益

尊敬的广大客户:您们好!RICOOR非常感谢中国广大客户对英国ROSE电子腭位仪/动态腭电图仪以及全套豪华配套产品的热情亲睐和大力支持,RICOOR将一如既往的为中国广大客户提供高性价比的产品和专业的技术。同时,为了更进一步维护和保障中国广大客户的合法权益,特此向中国广大客户公布所有相关信息:1:在第一次使用ROSE设备注册的时候必须联网。2:每一套ROSE设备只拥有唯一授权编码,RICOOR与ROSE厂家通过互联网进行追踪确认。3:请您务必妥善保管好您的唯一授权编码及安装光盘,如果唯一授权编码遗忘或丢失,请您联系RICOOR,RICOOR将为您免费提供您的原始唯一授权编码。4:您在成功安装ROSE硬件及软件包后请不要重装该电脑的系统,以免造成您不能使用ROSE设备,如果需要安装请联系RICOOR。5:您在成功安装ROSE硬件及软件包后请不要在其他电脑上进行再次或多次安装,如果多次安装无效,ROSE软件包的安装将进入永远无法启动状态,同时您的多次安装信息已通过互联网实时发送到RICOOR和ROSE。再次感谢中国广大客户对RICOOR总代理的ROSE产品感兴趣!如果您有对ROSE设备有任何的疑虑,请不要犹豫立即联系RICOOR,谢谢。附. 全套豪华配置:英国ROSE动态腭电图仪/电子腭位仪英国ROSE SNORS+ Anemometer风力计英国ROSE Nasality Microphone鼻音麦克风英国Laryngograph电子声门仪
2023-07-17 12:36:421

用英文介绍风扇的用处以及不可以接近之处

A mechanical fan is an electrically powered device used to produce an airflow for the purpose of creature comfort (particularly in the heat), ventilation, exhaust, cooling or any other gaseous transport.Mechanically, a fan can be any revolving vane or vanes used for producing currents of air. Fans produce air flows with high volume and low pressure, as opposed to a gas compressor which produces high pressures at a comparatively low volume. A fan blade will often rotate when exposed to an air stream, and devices that take advantage of this, such as anemometers and wind turbines often have designs similar to that of a fan.The wind blade must nver be touched under circulation. Not only does it slow down the normal function of a fan, more importantly it will slice you fingers. Offcouse, the power line is also not a toy. Since the fan runs on electicity, safety precautions should always be needed.
2023-07-17 12:37:021

python 批量处理csv数据,并进行数据分析,绘制基本散点图

用os模块得到目录下的所有csv文件,然后将已经处理过的csv文件名存到一个文件中,每次得到目录下所有csv文件名列表,如果不在已经处理的csv文件名列表中,则使用你的方法将数据提取出来,并将相应的csv文件名加入到 已经处理的csv文件名列表中。
2023-07-17 12:37:121

electricalshop的翻译是什么

electricalshop的意思是:n.电工场;电工车间;家电商场。electricalshop的意思是:n.电工场;电工车间;家电商场。electricalshop的例句是Ifyouwanttobuyawalkman,youcangotoanelectricalshop.假如你想买一个随身听,你可以去电器店。DramaJackyCheungplaysalittlealooffromtheelectricalshopeastkind-heartedpersonalitybutambitions.戏中张学友饰演一名与世无争的电器店少东,性格心地善良但胸无大志。Thisshopdealsinelectricalgoods.这家商店经营电气商品。一、网络释义点此查看electricalshop的详细内容 电工场...电力设备,电器设备electricalequipment电工场electricalshop电机规范electricalspecification... 家电商场...clothesshop服装店electricalshop家电商场sportsshop体育用品商店... 电工车间电工车间electricalshop;electrician"sshop;electrotechnicaldepartment 电器店...drycleaners干洗店electricalshop电器店estateagents地产代理...二、例句Ifyouwanttobuyawalkman,youcangotoanelectricalshop.假如你想买一个随身听,你可以去电器店。DramaJackyCheungplaysalittlealooffromtheelectricalshopeastkind-heartedpersonalitybutambitions.戏中张学友饰演一名与世无争的电器店少东,性格心地善良但胸无大志。Thisshopdealsinelectricalgoods.这家商店经营电气商品。electricalshop的相关临近词electricalness、electrical、electricaltoothbrush、electricalequipments、electricalanemometer、electricalinterlocks、electricalagingtest、electricalproduction、electricaltransition、electricalexcitation、electricalprocessing、electricalpowerunit点此查看更多关于electricalshop的详细信息
2023-07-17 12:37:181

warning threshold中文翻译

Fan probe warning threshold ( s ) set successfully 风扇探测器警告阈值已成功设置。 Current probe warning threshold ( s ) set successfully 电流探测器警告阈值已成功设置。 Voltage probe warning threshold ( s ) set successfully (电压探测器警告阈值已成功设置。 ) Temperature probe warning threshold ( s ) set successfully (温度探测器警告阈值已成功设置。 ) This is mostly due to higher temperatures and reduced cloudiness and precipitation over europe and it leads to a higher number of ozone events exceeding information and warning thresholds 最大可能原因为高温、云量降低及雨量下降而导致臭氧浓度超过标准。 The value given by the mand specifies more than 3 digits after the decimal point . a vapd minimum warning threshold value for volts contains up to 3 digits after the decimal point (此命令所指定的值在其小数点后超过3位数。有效的电压最小警告阈值在其小数点后最多保留3位。 ) Identifies the performance counter that exceeded the threshold , the value of the performance counter sample , and whether the value exceeded the critical threshold level or just the warning threshold level 标识超出阈值的性能计数器、性能计数器示例的值以及该值是超出关键阈值级别还是只超出警告阈值级别。 The value given by the mand specifies more than 3 digits after the decimal point . a vapd minimum warning threshold value for volts contains up to 3 digits after the decimal point (错误!小数点后的位数超过3位,读数为3 . 3000此命令所指定的值在其小数点后超过3位数。有效的电压最小警告阈值在其小数点后只保留3位。 ) The sensor work consists of nine ground - based anemometers and a wind profiler . wind information is processed by a miniputer in real time ; and puted wind shear and crosswind are pared with predetermined warning thresholds 一部小型电脑把收集得来的资料即时处理,把风切变及侧风数值计算出来并和预设的临界值进行比较,所得的结果会显示于图形显示器上。 The sensor work consists of nine ground - based anemometers and a wind profiler . wind information is processed by a miniputer in real time ; and puted wind shear and crosswind are pared with predetermined warning thresholds 一部小型电脑把收集得来的资料即时处理,把风切变及侧风数值计算出来并和预设的临界值进行比较,所得的结果会显示于图形显示器上。
2023-07-17 12:37:251

求在 2010年 南开大学 举办的 “中国大学生物理学术竞赛 ”题目,谢谢

1. Adhesive tapeDetermine the force necessary to remove a piece of adhesive tape from a horizontal surface. Investigate the influence of relevant parameters. 2. Air drying Table utensils (dishes, cutlery, etc.), after being washed, dry differently. Investigate how the time of drying depends on relevant parameters. 3. Bouncing flamePlace a flame (e.g. from a Bunsen burner) between two charged parallel metal plates. Investigate the motion of the flame. 4. Breaking spaghettiFind the conditions under which dry spaghetti falling on a hard floor does not break. 5. CarBuild a model car powered by an engine using an elastic air-filled toy-balloon as the energy source. Determine how the distance travelled by the car depends on relevant parameters and maximize the efficiency of the car. 6. ConvectionIn a container filled with a liquid, heat transport will occur when the bottom of the container is heated and the top surface is cooled. How does the phenomenon change when the container rotates about its vertical axis? 7. Cup drum A plastic cup is held upside-down and tapped on its base. Investigate the sound produced when the open end of the cup is above, on or below a water surface. 8. Domino amplifierA row of dominoes falling in sequence after the first is displaced is a well known phenomenon. If a row of "dominoes" gradually increases in height, investigate how the energy transfer takes place and determine any limitations to the size of the dominoes. 9. Escaping powder When a hot wire is plunged into a beaker of water with powder (e.g. lycopodium) floating on the surface, the powder moves rapidly. Investigate the parameters that alter the speed of movement of the powder. 10. Faraday heapingWhen a container filled with small spheres (e.g. mustard seeds) is vibrated vertically with a frequency between 1 – 10 Hz, so called Faraday heaping occurs. Explore this phenomenon. 11. FingerprintsFill a glass with a liquid and hold it in your hands. If you look from above at the inner walls of the glass, you will notice that the only thing visible through the walls is a very bright and clear image of patterns on your fingertips. Study and explain this phenomenon. 12. Levitating spinnerA toy consists of a magnetic spinning top and a plate containing magnets (e.g. "Levitron"). The top may levitate above the magnetic plate. Under what conditions can one observe the phenomenon? 13. Light bulbWhat is the ratio between the thermal energy and light energy emitted from a small electric bulb depending on the voltage applied to a bulb? 14. Moving cylinderPlace a sheet of paper on a horizontal table and put a cylindrical object (e.g. a pencil) on the paper. Pull the paper out. Observe and investigate the motion of the cylinder until it comes to rest. 15. Slow descentDesign and make a device, using one sheet of A4 80 gram per m2 paper that will take the longest possible time to fall to the ground through a vertical distance of 2.5m. A small amount of glue may be used. Investigate the influence of the relevant parameters. 16. Smoke stream A glass jar is covered with cellophane. A tightly folded paper tube of length 4-5 cm is inserted hermetically into the jar through the cellophane cover. The tube is oriented horizontally. If one burns the outside end of the tube the dense smoke flows into the jar. Explore this phenomenon. 17. VikingsAccording to a legend, Vikings were able to navigate in an ocean even during overcast (dull) weather using tourmaline crystals. Study how it is possible to navigate using a polarizing material. What is the accuracy of the method?
2023-07-17 12:37:352

HWA是什么意思?

楼主,HWA也叫高清无线音频,全称是Hi-ResWirelessAudio,是高清无线音频标准。HWA是由中国电子音响行业协会、中国电子技术标准化研究院和华为发起,30家企业共同编制的高清无线音频标准。HWA提供了更加综合的无线高清音质体验标准,是一个开放式标准,需要符合性能指标要求,同时需要通过第三方实验室认证。HWA重新定义了音质各个参数,如编解码器、无线传输、延时、抗干扰、主动降噪、透传、续航等。
2023-07-17 12:37:433

UVW展开啥意思?

3D 动态MAX (maximum)最大的、最大限度的UVW anemometer 三维风速表 3D MAX9 UVW 意思大概是动态最大限度的三维风速表
2023-07-17 12:37:532

风向标和风力计合在一起被称作什么

测量风力风速的仪器叫做风速计(anemometer)。 气象台站最常用的为风杯风速计,它由3个互成120°固定在支架上的抛物 锥空杯组成感应部分,空杯的凹面都顺向一个方向.整个感应部分安装在一根垂直旋转轴上,在风力的作用下,风杯绕轴以正比于风速的转速旋转. 另一种旋转式风速计为旋桨式风速计,由一个三叶或四叶螺旋桨组成感应部分,将其安装在一个风向标的前端,使它随时对准风的来向.桨叶绕水平轴以正比于风速的转速旋转。
2023-07-17 12:38:211

测量风速的仪器叫什么

测量风速的仪器叫做风速计(anemometer)。气象台站最常用的为风杯风速计,它由3个互成120°固定在支架上的抛物锥空杯组成感应部分,空杯的凹面都顺向一个方向。整个感应部分安装在一根垂直旋转轴上,在风力的作用下,风杯绕轴以正比于风速的转速旋转。另一种旋转式风速计为旋桨式风速计,由一个三叶或四叶螺旋桨组成感应部分,将其安装在一个风向标的前端,使它随时对准风的来向。桨叶绕水平轴以正比于风速的转速旋转。
2023-07-17 12:38:311

什么是观侧风向的仪器,风向标箭头所指的方向就是当时什么。什么是观测风力的仪器?

测风向用风向标,风向指吹来的风的方向,也是风向标箭头指的反方向。 例如:风从南方吹来,是南风,这是风向标箭头指向北边。以此类推。希望对你有帮助满意请采纳,O(∩_∩)O谢谢!
2023-07-17 12:38:391

什么是观侧风向的仪器?风向标箭头所指的方向又是指向哪里?

风速仪是观侧风向的仪器。风向标箭头指向风的来源。风速仪(anemometer) 顾名思义是测量空气流速的仪器。它的种类较多,气象台站最常用的为风杯风速计,它由3个互成120°固定在支架上的抛物 锥空杯组成感应部分,空杯的凹面都顺向一个方向。整个感应部分安装在一根垂直旋转轴上,在风力的作用下,风杯绕轴以正比于风速的转速旋转。另一种旋转式风速计为旋桨式风速计,由一个三叶或四叶螺旋桨组成感应部分,将其安装在一个风向标的前端,使它随时对准风的来向。桨叶绕水平轴以正比于风速的转速旋转。风速仪表属于安全防护、环境监测类的计量仪表,是我国计量法规定的强制性检定计量器具。除出厂销售需要具备相应的校准报告,也需按JJG(建设)0001-1992 《热球式风速仪检定规程》的要求每年定期到国家空调设备质量监督检验中心或者中国建筑科学研究院建筑能源与环境检测中心进行定期校准,并根据其出具法定校准证书对仪器各方面进行调整以获得最佳工作状态。
2023-07-17 12:38:531

1个风速计功率多少w

1个风速计功率工作电压为AC85V~AC260V,风速计(anemometer)顾名思义是测量空气流速的仪器。它的种类较多,气象台站最常用的为风杯风速计。
2023-07-17 12:39:081

为什么拉丁词源anemo表示风?

呼吸和风相似
2023-07-17 12:39:162

三倍风速仪

风速计(anemometer)是测量空气流速的仪器。它的种类较多,气象台站最常用的为风杯风速计,它由3个互成120°固定在支架上的抛物锥空杯组成感应部分,空杯的凹面都顺向一个方向。整个感应部分安装在一根垂直旋转轴上,在风力的作用下,风杯绕轴以正比于风速的转速旋转。
2023-07-17 12:39:381

什么是测量风速的仪器它有几个风杯连接在一个类似于自行车轮子的辐条上

1、测量风速的一起叫风速计(anemometer)是测量空气流速的仪器。2、风速计的种类较多,气象台站最常用的为风杯风速计,它由3个互成120°固定在支架上的抛物锥空杯组成感应部分,空杯的凹面都顺向一个方向。整个感应部分安装在一根垂直旋转轴上,在风力的作用下,风杯绕轴以正比于风速的转速旋转。继而测量出风速数值。
2023-07-17 12:39:471

风速传感器输出的是脉冲信号,用万用表可以检测吗,

你好!可以用万用表检测风速传感器的好坏。但是,不能用万用表检测风速的大小程度。把风速仪接上设备,用手慢慢转动风叶,用万用表电压档测量风速仪2根线之间,正常时可以看到万用表电压读数在高(比如5v)和低(比如0v)之间变动。这是低速脉冲测量的结果。我的回答你还满意吗~~
2023-07-17 12:40:113

ultrasonic anemometer是什么意思

你好!ultrasonic anemometer超声波风速计
2023-07-17 12:40:181

风速计 创意

http://bk.baidu.com/view/190902.htm
2023-07-17 12:40:274

electricalshop的解释electricalshop的解释是什么

electricalshop的意思是:n.电工场;电工车间;家电商场。electricalshop的意思是:n.电工场;电工车间;家电商场。electricalshop的例句是Ifyouwanttobuyawalkman,youcangotoanelectricalshop.假如你想买一个随身听,你可以去电器店。DramaJackyCheungplaysalittlealooffromtheelectricalshopeastkind-heartedpersonalitybutambitions.戏中张学友饰演一名与世无争的电器店少东,性格心地善良但胸无大志。Thisshopdealsinelectricalgoods.这家商店经营电气商品。一、网络释义点此查看electricalshop的详细内容 电工场...电力设备,电器设备electricalequipment电工场electricalshop电机规范electricalspecification... 家电商场...clothesshop服装店electricalshop家电商场sportsshop体育用品商店... 电工车间电工车间electricalshop;electrician"sshop;electrotechnicaldepartment 电器店...drycleaners干洗店electricalshop电器店estateagents地产代理...二、例句Ifyouwanttobuyawalkman,youcangotoanelectricalshop.假如你想买一个随身听,你可以去电器店。DramaJackyCheungplaysalittlealooffromtheelectricalshopeastkind-heartedpersonalitybutambitions.戏中张学友饰演一名与世无争的电器店少东,性格心地善良但胸无大志。Thisshopdealsinelectricalgoods.这家商店经营电气商品。electricalshop的相关临近词electricalness、electrical、electricaltoothbrush、electricalequipments、electricalanemometer、electricalinterlocks、electricalagingtest、electricalproduction、electricaltransition、electricalexcitation、electricalprocessing、electricalpowerunit点此查看更多关于electricalshop的详细信息
2023-07-17 12:40:421

electricalshop的意思electricalshop的意思是什么

electricalshop的意思是:n.电工场;电工车间;家电商场。electricalshop的意思是:n.电工场;电工车间;家电商场。electricalshop的例句是Ifyouwanttobuyawalkman,youcangotoanelectricalshop.假如你想买一个随身听,你可以去电器店。DramaJackyCheungplaysalittlealooffromtheelectricalshopeastkind-heartedpersonalitybutambitions.戏中张学友饰演一名与世无争的电器店少东,性格心地善良但胸无大志。Thisshopdealsinelectricalgoods.这家商店经营电气商品。一、网络释义点此查看electricalshop的详细内容 电工场...电力设备,电器设备electricalequipment电工场electricalshop电机规范electricalspecification... 家电商场...clothesshop服装店electricalshop家电商场sportsshop体育用品商店... 电工车间电工车间electricalshop;electrician"sshop;electrotechnicaldepartment 电器店...drycleaners干洗店electricalshop电器店estateagents地产代理...二、例句Ifyouwanttobuyawalkman,youcangotoanelectricalshop.假如你想买一个随身听,你可以去电器店。DramaJackyCheungplaysalittlealooffromtheelectricalshopeastkind-heartedpersonalitybutambitions.戏中张学友饰演一名与世无争的电器店少东,性格心地善良但胸无大志。Thisshopdealsinelectricalgoods.这家商店经营电气商品。electricalshop的相关临近词electricalness、electrical、electricaltoothbrush、electricalequipments、electricalanemometer、electricalinterlocks、electricalagingtest、electricalproduction、electricaltransition、electricalexcitation、electricalprocessing、electricalpowerunit点此查看更多关于electricalshop的详细信息
2023-07-17 12:41:011

electricalshop的意思是什么

electricalshop的意思是:n.电工场;电工车间;家电商场。electricalshop的意思是:n.电工场;电工车间;家电商场。electricalshop的例句是Ifyouwanttobuyawalkman,youcangotoanelectricalshop.假如你想买一个随身听,你可以去电器店。DramaJackyCheungplaysalittlealooffromtheelectricalshopeastkind-heartedpersonalitybutambitions.戏中张学友饰演一名与世无争的电器店少东,性格心地善良但胸无大志。Thisshopdealsinelectricalgoods.这家商店经营电气商品。一、网络释义点此查看electricalshop的详细内容 电工场...电力设备,电器设备electricalequipment电工场electricalshop电机规范electricalspecification... 家电商场...clothesshop服装店electricalshop家电商场sportsshop体育用品商店... 电工车间电工车间electricalshop;electrician"sshop;electrotechnicaldepartment 电器店...drycleaners干洗店electricalshop电器店estateagents地产代理...二、例句Ifyouwanttobuyawalkman,youcangotoanelectricalshop.假如你想买一个随身听,你可以去电器店。DramaJackyCheungplaysalittlealooffromtheelectricalshopeastkind-heartedpersonalitybutambitions.戏中张学友饰演一名与世无争的电器店少东,性格心地善良但胸无大志。Thisshopdealsinelectricalgoods.这家商店经营电气商品。electricalshop的相关临近词electricalness、electrical、electricaltoothbrush、electricalequipments、electricalanemometer、electricalinterlocks、electricalagingtest、electricalproduction、electricaltransition、electricalexcitation、electricalprocessing、electricalpowerunit点此查看更多关于electricalshop的详细信息
2023-07-17 12:41:081

electricalshop怎么读

electricalshop的读音是:。electricalshop的读音是:。electricalshop的例句是Ifyouwanttobuyawalkman,youcangotoanelectricalshop.假如你想买一个随身听,你可以去电器店。DramaJackyCheungplaysalittlealooffromtheelectricalshopeastkind-heartedpersonalitybutambitions.戏中张学友饰演一名与世无争的电器店少东,性格心地善良但胸无大志。Thisshopdealsinelectricalgoods.这家商店经营电气商品。electricalshop的意思是n.电工场;电工车间;家电商场。一、网络释义点此查看electricalshop的详细内容 电工场...电力设备,电器设备electricalequipment电工场electricalshop电机规范electricalspecification... 家电商场...clothesshop服装店electricalshop家电商场sportsshop体育用品商店... 电工车间电工车间electricalshop;electrician"sshop;electrotechnicaldepartment 电器店...drycleaners干洗店electricalshop电器店estateagents地产代理...二、例句Ifyouwanttobuyawalkman,youcangotoanelectricalshop.假如你想买一个随身听,你可以去电器店。DramaJackyCheungplaysalittlealooffromtheelectricalshopeastkind-heartedpersonalitybutambitions.戏中张学友饰演一名与世无争的电器店少东,性格心地善良但胸无大志。Thisshopdealsinelectricalgoods.这家商店经营电气商品。electricalshop的相关临近词electricalness、electrical、electricaltoothbrush、electricalequipments、electricalanemometer、electricalinterlocks、electricalagingtest、electricalproduction、electricaltransition、electricalexcitation、electricalprocessing、electricalpowerunit点此查看更多关于electricalshop的详细信息
2023-07-17 12:41:151

求2010年中国大学生物理竞赛题目答案

2010年的是:竞赛题目(英文)1. Electromagnetic cannonA solenoid can be used to fire a small ball. A capacitor is used to energize the solenoid coil. Build a device with a capacitor charged to a maximum 50V. Investigate the relevant parameters and maximize the speed of the ball. 2. Brilliant patternSuspend a water drop at the lower end of a vertical pipe. Illuminate the drop using a laser pointer and observe the pattern created on a screen. Study and explain the structure of the pattern. 3. Steel ballsColliding two large steel balls with a thin sheet of material (e.g. paper) in between may “burn” a hole in the sheet. Investigate this effect for various materials. 4. Soap filmCreate a soap film in a circular wire loop. The soap film deforms when a charged body is placed next to it. Investigate how the shape of the soap film depends on the position and nature of the charge. 5. GridA plastic grid covers the open end of a cylindrical vessel containing water. The grid is covered and the vessel is turned upside down. What is the maximal size of holes in the grid so that water does not flow out when the cover is removed? 6. IceA wire with weights attached to each end is placed across a block of ice. The wire may pass through the ice without cutting it. Investigate the phenomenon. 7. Two flasksTwo similar flasks (one is empty, one contains water) are each connected by flexible pipes to a lower water reservoir. The flasks are heated to 100°C and this temperature is held for some time. Heating is stopped and as the flasks cool down, water is drawn up the tubes. Investigate and describe in which tube the water goes up faster and in which the final height is greater. How does this effect depend on the time of heating? 8. Liquid light guideA transparent vessel is filled with a liquid (e.g. water). A jet flows out of the vessel. A light source is placed so that a horizontal beam enters the liquid jet (see picture). Under what conditions does the jet operate like a light guide? 9. Sticky waterWhen a horizontal cylinder is placed in a vertical stream of water, the stream can follow the cylinder"s circumference along the bottom and continue up the other side before it detaches. Explain this phenomenon and investigate the relevant parameters. 10. Calm surfaceWhen wind blows across a water surface, waves can be observed. If the water is covered by an oil layer, the waves on the water surface will diminish. Investigate the phenomenon. 11. SandDry sand is rather soft to walk on when compared to damp sand. However sand containing a significant amount of water becomes soft again. Investigate the parameters that affect the softness of sand. 12. Wet towelsWhen a wet towel is flicked, it may create a cracking sound like a whip. Investigate the effect. Why does a wet towel crack louder than a dry one? 13. Shrieking rodA metal rod is held between two fingers and hit. Investigate how the sound produced depends on the position of holding and hitting the rod? 14. Magnetic springTwo magnets are arranged on top of each other such that one of them is fixed and the other one can move vertically. Investigate oscillations of the magnet. 15. Paper anemometerWhen thin strips of paper are placed in an air flow, a noise may be heard. Investigate how the velocity of the air flow can be deduced from this noise? 16. Rotating springA helical spring is rotated about one of its ends around a vertical axis. Investigate the expansion of the spring with and without an additional mass attached to its free end. 17. Kelvin"s dropperConstruct Kelvin"s dropper. Measure the highest voltage it can produce. Investigate its dependence on relevant parameters.竞赛题目(中文)(此版本的译文某些地方可能有出入,如果你发现有哪些地方译得不对请及时指出)1.电磁炮螺线管可以用来发射一个小球体。使用电容器为螺线管提供能量。以一个以50V为最大电压的电容器制作一个装置。探究球体速度的界限和如何是球体速度达到上限。2.完美图像一滴水悬挂在纵向水管的出口处,用一束激光去照射,观察屏上呈现的图像。研究并解释图像的结构。3钢球用两个巨大的钢球在一个软材料薄片(例如一张纸)处碰撞,会在这片材料上“烧”出一个洞。研究这种效应在不同材料上的体现。4.肥皂膜在一个圆形的水槽中制造一个肥皂膜。当把一个带电物体放在旁边时会使肥皂膜变形。探究该物体带电的方位和电性如何影响上述效应。5.格栅一个塑料格栅盖在一个盛有水的圆柱形容器顶部。在格栅上面盖上盖子,把容器倒置过来。在盖子移开时水不会落下来的前提下,格栅的最大孔径是多少?6.冰块一个两边挂有重物的金属线被横置在一个冰块上,金属线可能会自动地从冰块中穿过。探究这一现象。7.两个烧瓶两个相同的烧瓶(一个是空的,另一个盛有水)分别连接着一根通向一个低处蓄水池的软导管。两个烧瓶都被加热到100摄氏度并保持在此温度一段时间。当加热停止,烧瓶正在冷却时,水从导管中被吸了上去。探究在哪一个烧瓶中水会较快的被吸上去,哪一个中的水位最高。加热的时间如何影响这一效应。8.液体导光(让光线在水流里全反射)一个透明的圆柱形容器装满了一种液体(例如水),一束水流从容器中流出来。放置一个光源,使光束水平地射入液体流。探究在何种情况下这束水流可以像光纤一样。9.粘稠的水当把一个竖直的圆柱体被放置在一束竖直流下的水流之中,这束水流在掉下来之前可以沿圆柱体的圆形底面流到另一端。解释这种现象并探究相关参数。10.平静的水面当风吹过水面时,会产生明显的波纹,如果水面被一层油膜盖住,水面的波纹就会减小。探究这一现象。11.沙子相比于湿的沙子,在干燥的沙子上面行走感觉更柔软,然而,含有大量水分的沙子会重新变得柔软。探究影响沙子柔软程度的相关因素。12.湿毛巾如果拍动一条湿毛巾(我猜应该是用湿毛巾去抽打一个坚硬物体),会产生像用鞭子抽打一样的劈啪声。探究这一现象。为什么湿毛巾会比干毛巾发出更响亮的声音。13.尖叫的棒子用两个手指拿起一个铁棒,并(用某种方式)敲打它。探究手指所拿的位置和敲击的位置如何影响发出的声响。14.磁体弹簧两块磁体,一个放在另一个的上边。这样其中一个(下面那个)就被固定住,另一个可以竖直的移动,探究这块磁体的振动。15.纸质风速计当把一个薄纸条放在流动的空气中时,可能会听到一种声音。探究如何依据这种声音推断风速。16.转动的弹簧一个螺旋的弹簧,一端被固定着,围绕着一个竖直的轴转动,探究弹簧自由端挂重物和不挂重物时弹簧的伸长。17.开尔文滴管(竖直放置的磁流体发电器,开尔文滴管的具体构造最好还是去考证一下)制造一个开尔文滴管,测量它能产生的最大电压,探究它所依赖的相关因素。
2023-07-17 12:41:251

风速仪探头发热

1. 热线风速仪简介热线风速仪(Hot wire Anemometer,简称HWA),发明于20世纪20年代。其基本原理是将一根细的金属丝放在流体中,通电流加热金属丝,使其温度高于流体的温度,因此将金属丝称为“热线”。当流体沿垂直方向流过金属丝时,将带走金属丝的一部分热量,使金属丝温度下降。根据强迫对流热交换理论,可导出热线散失的热量Q与流体的速度v之间存在关系式(D3.4.4a)上式称为金(L.V.King,1914)公式,R、I分别为热线的电阻和流过的电流强度,ΔT为热线与流体的温度差,A、B为与流体和热线有关的物理常数。考虑到热线材料的电阻温度特性,(D3.4.4a)式可化为(D3.4.4b)上式中U为热线的输出电压,A",B"为与热线的电阻温度系数有关的物理常数,由实验确定。这样通过测量热线两端的电压,即可确定流速。标准的热线探头由两根支架张紧一根短而细的金属丝组成,如图2.1所示。金属丝通常用铂、铑、钨等熔点高、延展性好的金属制成。常用的丝直径为5μm,长为2 mm;最小的探头直径仅1μm,长为0.2 mm。根据不同的用途,热线探头还做成双丝、三丝、斜丝及V形、X形等。为了增加强度,有时用金属膜代替金属丝,通常在一热绝缘的基体上喷镀一层薄金属膜,称为热膜探头,如图2.2所示。 热线探头在使用前必须进行校准。静态校准是在专门的标准风洞里进行的,测量流速与输出电压之间的关系并画成标准曲线;动态校准是在已知的脉动流场中进行的,或在风速仪加热电路中加上一脉动电信号,校验热线风速仪的频率响应,若频率响应不佳可用相应的补偿线路加以改善。热线风速仪的优点是(1)体积小,对流场干扰小;(2)适用范围广。不仅可用于气体也可用于液体,在气体的亚声速、跨声速和超声速流动中均可使用;除了测量平均速度外,还可测量脉动值和湍流量;除了测量单方向运动外还可同时测量多个方向的速度分量。(3)频率响应高,可高达1 MH z。(4)测量精度高,重复性好。热线风速仪的缺点是探头对流场有一定干扰,热线容易断裂。热线风速仪的主要用途是(1)测量平均流动的速度和方向。(2)测量来流的脉动速度及其频谱。(3)测量湍流中的雷诺应力及两点的速度相关性、时间相关性。(4)测量壁面切应力(通常是采用与壁面平齐放置的热膜探头来进行的,原理与热线测速相似)。(5)测量流体温度(事先测出探头电阻随流体温度的变化曲线,然后根据测得的探头电阻就可确定温度。除此以外还开发出许多专业用途。
2023-07-17 12:41:451

风速传感器输出的是脉冲信号,用万用表可以检测吗,

有的万用表可以。
2023-07-17 12:41:565

求2010年中国大学生物理竞赛题目答案

2010年的是:竞赛题目(英文)1. Electromagnetic cannonA solenoid can be used to fire a small ball. A capacitor is used to energize the solenoid coil. Build a device with a capacitor charged to a maximum 50V. Investigate the relevant parameters and maximize the speed of the ball. 2. Brilliant patternSuspend a water drop at the lower end of a vertical pipe. Illuminate the drop using a laser pointer and observe the pattern created on a screen. Study and explain the structure of the pattern. 3. Steel ballsColliding two large steel balls with a thin sheet of material (e.g. paper) in between may “burn” a hole in the sheet. Investigate this effect for various materials. 4. Soap filmCreate a soap film in a circular wire loop. The soap film deforms when a charged body is placed next to it. Investigate how the shape of the soap film depends on the position and nature of the charge. 5. GridA plastic grid covers the open end of a cylindrical vessel containing water. The grid is covered and the vessel is turned upside down. What is the maximal size of holes in the grid so that water does not flow out when the cover is removed? 6. IceA wire with weights attached to each end is placed across a block of ice. The wire may pass through the ice without cutting it. Investigate the phenomenon. 7. Two flasksTwo similar flasks (one is empty, one contains water) are each connected by flexible pipes to a lower water reservoir. The flasks are heated to 100°C and this temperature is held for some time. Heating is stopped and as the flasks cool down, water is drawn up the tubes. Investigate and describe in which tube the water goes up faster and in which the final height is greater. How does this effect depend on the time of heating? 8. Liquid light guideA transparent vessel is filled with a liquid (e.g. water). A jet flows out of the vessel. A light source is placed so that a horizontal beam enters the liquid jet (see picture). Under what conditions does the jet operate like a light guide? 9. Sticky waterWhen a horizontal cylinder is placed in a vertical stream of water, the stream can follow the cylinder"s circumference along the bottom and continue up the other side before it detaches. Explain this phenomenon and investigate the relevant parameters. 10. Calm surfaceWhen wind blows across a water surface, waves can be observed. If the water is covered by an oil layer, the waves on the water surface will diminish. Investigate the phenomenon. 11. SandDry sand is rather soft to walk on when compared to damp sand. However sand containing a significant amount of water becomes soft again. Investigate the parameters that affect the softness of sand. 12. Wet towelsWhen a wet towel is flicked, it may create a cracking sound like a whip. Investigate the effect. Why does a wet towel crack louder than a dry one? 13. Shrieking rodA metal rod is held between two fingers and hit. Investigate how the sound produced depends on the position of holding and hitting the rod? 14. Magnetic springTwo magnets are arranged on top of each other such that one of them is fixed and the other one can move vertically. Investigate oscillations of the magnet. 15. Paper anemometerWhen thin strips of paper are placed in an air flow, a noise may be heard. Investigate how the velocity of the air flow can be deduced from this noise? 16. Rotating springA helical spring is rotated about one of its ends around a vertical axis. Investigate the expansion of the spring with and without an additional mass attached to its free end. 17. Kelvin"s dropperConstruct Kelvin"s dropper. Measure the highest voltage it can produce. Investigate its dependence on relevant parameters.竞赛题目(中文)(此版本的译文某些地方可能有出入,如果你发现有哪些地方译得不对请及时指出)1.电磁炮螺线管可以用来发射一个小球体。使用电容器为螺线管提供能量。以一个以50V为最大电压的电容器制作一个装置。探究球体速度的界限和如何是球体速度达到上限。2.完美图像一滴水悬挂在纵向水管的出口处,用一束激光去照射,观察屏上呈现的图像。研究并解释图像的结构。3钢球用两个巨大的钢球在一个软材料薄片(例如一张纸)处碰撞,会在这片材料上“烧”出一个洞。研究这种效应在不同材料上的体现。4.肥皂膜在一个圆形的水槽中制造一个肥皂膜。当把一个带电物体放在旁边时会使肥皂膜变形。探究该物体带电的方位和电性如何影响上述效应。5.格栅一个塑料格栅盖在一个盛有水的圆柱形容器顶部。在格栅上面盖上盖子,把容器倒置过来。在盖子移开时水不会落下来的前提下,格栅的最大孔径是多少?6.冰块一个两边挂有重物的金属线被横置在一个冰块上,金属线可能会自动地从冰块中穿过。探究这一现象。7.两个烧瓶两个相同的烧瓶(一个是空的,另一个盛有水)分别连接着一根通向一个低处蓄水池的软导管。两个烧瓶都被加热到100摄氏度并保持在此温度一段时间。当加热停止,烧瓶正在冷却时,水从导管中被吸了上去。探究在哪一个烧瓶中水会较快的被吸上去,哪一个中的水位最高。加热的时间如何影响这一效应。8.液体导光(让光线在水流里全反射)一个透明的圆柱形容器装满了一种液体(例如水),一束水流从容器中流出来。放置一个光源,使光束水平地射入液体流。探究在何种情况下这束水流可以像光纤一样。9.粘稠的水当把一个竖直的圆柱体被放置在一束竖直流下的水流之中,这束水流在掉下来之前可以沿圆柱体的圆形底面流到另一端。解释这种现象并探究相关参数。10.平静的水面当风吹过水面时,会产生明显的波纹,如果水面被一层油膜盖住,水面的波纹就会减小。探究这一现象。11.沙子相比于湿的沙子,在干燥的沙子上面行走感觉更柔软,然而,含有大量水分的沙子会重新变得柔软。探究影响沙子柔软程度的相关因素。12.湿毛巾如果拍动一条湿毛巾(我猜应该是用湿毛巾去抽打一个坚硬物体),会产生像用鞭子抽打一样的劈啪声。探究这一现象。为什么湿毛巾会比干毛巾发出更响亮的声音。13.尖叫的棒子用两个手指拿起一个铁棒,并(用某种方式)敲打它。探究手指所拿的位置和敲击的位置如何影响发出的声响。14.磁体弹簧两块磁体,一个放在另一个的上边。这样其中一个(下面那个)就被固定住,另一个可以竖直的移动,探究这块磁体的振动。15.纸质风速计当把一个薄纸条放在流动的空气中时,可能会听到一种声音。探究如何依据这种声音推断风速。16.转动的弹簧一个螺旋的弹簧,一端被固定着,围绕着一个竖直的轴转动,探究弹簧自由端挂重物和不挂重物时弹簧的伸长。17.开尔文滴管(竖直放置的磁流体发电器,开尔文滴管的具体构造最好还是去考证一下)制造一个开尔文滴管,测量它能产生的最大电压,探究它所依赖的相关因素。
2023-07-17 12:42:161

electricalshop的解释是什么

electricalshop的意思是:n.电工场;电工车间;家电商场。electricalshop的意思是:n.电工场;电工车间;家电商场。electricalshop的例句是Ifyouwanttobuyawalkman,youcangotoanelectricalshop.假如你想买一个随身听,你可以去电器店。DramaJackyCheungplaysalittlealooffromtheelectricalshopeastkind-heartedpersonalitybutambitions.戏中张学友饰演一名与世无争的电器店少东,性格心地善良但胸无大志。Thisshopdealsinelectricalgoods.这家商店经营电气商品。一、网络释义点此查看electricalshop的详细内容 电工场...电力设备,电器设备electricalequipment电工场electricalshop电机规范electricalspecification... 家电商场...clothesshop服装店electricalshop家电商场sportsshop体育用品商店... 电工车间电工车间electricalshop;electrician"sshop;electrotechnicaldepartment 电器店...drycleaners干洗店electricalshop电器店estateagents地产代理...二、例句Ifyouwanttobuyawalkman,youcangotoanelectricalshop.假如你想买一个随身听,你可以去电器店。DramaJackyCheungplaysalittlealooffromtheelectricalshopeastkind-heartedpersonalitybutambitions.戏中张学友饰演一名与世无争的电器店少东,性格心地善良但胸无大志。Thisshopdealsinelectricalgoods.这家商店经营电气商品。electricalshop的相关临近词electricalness、electrical、electricaltoothbrush、electricalequipments、electricalanemometer、electricalinterlocks、electricalagingtest、electricalproduction、electricaltransition、electricalexcitation、electricalprocessing、electricalpowerunit点此查看更多关于electricalshop的详细信息
2023-07-17 12:42:231

帮忙翻译下,翻译软件免了

原文让我有点晕看了楼上的答案...我晕倒了...- -
2023-07-17 12:42:423

煤炭gar和nar的差别

国内贸易常用发热量标准为收到基低位发热量( Qnet,ar) ,它反映煤炭的应用效果,但外界因素影响较大,如水分等,因此Qnet,ar 不能反映煤的真实品质。国际贸易通用发热量标准为空气干燥基高位发热量( Qgr,ad) ,它能较为准确的反映煤的真实品质,不受水分等外界因素影响
2023-07-17 12:41:371

出众的英文

superior
2023-07-17 12:41:384

blackpink成员资料(包括国家,年龄,队长是谁,训练了几年)

jennie 是在新西兰留的学
2023-07-17 12:41:415

How happy I will________(be)if you join me!

How happy I will___be_____(be)if you join me!
2023-07-17 12:41:423

iPad10取消传统接口,Type-C和Lighting接口有啥区别?

这两个不同的接口型号是不一样的,所以充电器和音频设备等都不可以通用。此次iPad更换新的接口,让很多用户都不习惯。
2023-07-17 12:41:434

委托书范本模板大全(通用6篇)

  现如今,委托书越来越被大家广泛使用。那么,你知道拟定委托书时需要注意哪些问题呢?以下是我为大家精心整理的“委托书范本模板大全(通用6篇)”,仅供您在工作和学习中参考。   篇一:委托书范本模板大全   委托单位:_________法定代表人:_____职务:________   受委托人:姓名:________工作单位:________职务:________电话:________   姓名:________工作单位:_________职务:________电话:________   现委托上列受委托人在我单位与__________纠纷一案中,作为我单位的诉讼(____审)代理人。   代理人____的代理权限为:全权代理,并特别授权代为承认、放弃、变更诉讼请求,协商和解,提起反诉,签收诉讼文书。   代理人____的代理权限为:一般代理,并特别授权收诉讼文书。   委托单位:(章)_________法定代表人:_________受托人:________   ____年____月____日   篇二:委托书范本模板大全   致:___________(投标人名称),为中华人民共和国合法企业,法定地址:________________。   (营业执照法定代表人)特授权________代表我公司全权办理_________________的投标、谈判、签约、执行等具体工作,并签署全部有关的文件、协议及合同。   我公司对被授权人签署的所有文件、协议及合同负全部责任。   在招标人收到撤销本授权的通知以前,本授权书一直有效。被授权人签署的所有文件、协议及合同(在本协议有效期内签署的)不因授权的撤销而失效。   被授权人不得转授权。   被授权人签名(章):________授权人签名(章):________   职务:________职务:________   联系电话:________________联系手机:________________单位传真:________________   公章   ________________年________月________日   注:   (1)本授权书必须由法定代表人本人签署,不接受法定代表人的委托人(比如公司总经理、商务经理)的转授权;   (2)若被授权人有两名或两名以上,如未特别声明,则任一被授权人签署的有关文件、协议、合同或处理的相关事务均应视为有效;   (3)每个投标人本项目只需填写一份授权书;   (4)字体加黑部分为必须填写的内容。   篇三:委托书范本模板大全   委托人(房屋征收部门):______________   地址:_____________________   法定代表人:______________   联系方式:_____________________   受托人(房屋征收实施单位):______________   地址:_____________________   法定代表人:_____________________   联系方式:_____________________   依据《xxxx条例》第五条第一款之规定,委托人将职权范围内征收工作中下列事项委托受托人:   一、进行调查、登记,具体包括:   1、征收补偿方案编制前,对征收范围内房屋现状进行调查、登记;   2、向相关部门调取被征收范围内房屋的土地、规划、房产等手续;   3、向民政部门、街道办事处(居委会)、社区调取被征收人是否符合住房保障条件情况;   4、___________________________________;   5、___________________________________。   二、拟定征收补偿方案:   1、委托房地产价格评估机构对被征收房屋价值进行预评估并提供相关材料;   2、确定拟征收房屋搬迁补偿、临时安置补偿、停产停业损失补偿的标准;   3、确定拟征收范围内符合住房保障条件的户数;   4、___________________________________;   5、___________________________________。   三、进行房屋征收与补偿政策的宣传、解释,就征收补偿的具体问题和被征收人协商。   四、组织被征收补偿方案进行征求意见、听证、论证、公示以及组织被征收人搬迁,委托建筑施工企业对被征收房屋予以拆除。   五、___________________________________。   委托人对受托人在委托范围内实施的行为负责监督,并对委托人在委托范围内的行为后果承担法律责任。   委托人(公章):______________受托人(公章):______________   法定代表人:______________法定代表人:______________   时间:_______年_____月____日时间:_______年_____月____日   篇四:委托书范本模板大全   委托人:____________   性别:_________________   身份证号:__________   联系电话:_________   被委托人:____________   性别:_________________   身份证号:____________   联系电话:___________   由于本人工作繁忙,不能亲自办理__________的相关手续,特委托________作为我的合法代理人,全权代表我办理相关事项,对委托人在办理上述事项过程中所签署的有关文件,我均予以认可,并承担相应的法律责任。   委托期限:自签字之日起至上述事项办完为止。   委托人:__________   _____年_____月_____日   篇五:委托书范本模板大全   _______单位:   本人因_________原因不能亲自到________办理_______事项,兹授权委托 _______先生/女士处理代办事项。委托人在权限范围内年签署的一切有关文件,我均承认。由此所造成的一切责任均由本人承担。   委托人(签名或盖章):__________ 被委托人(签名):____________   委托人身份证号码:____________ 受托人身份证号:____________   委托人_________   _____年_____月_____日   篇六:委托书范本模板大全   委托人:姓名_______性别_______出生年月_______民族_______工作单位_______职业_______住址_______。   被委托人:姓名_______性别_______出生年月_______民族_______工作单位_______职业_______住址_______。   现委托_______在我与_______交通事故一案中,作为我参加诉讼的委托代理人,委托权限如下:______________。   委托人:_______(签名或盖章)   被委托人:_____(签名或盖章)   _______年_______月________日
2023-07-17 12:41:341

l want to play cards. Do you want to join me的中文翻译是什么?

我想要玩扑克牌。你要和我一起玩吗?
2023-07-17 12:41:333

如何重新签名ipa文件

您好,很高兴能帮助您app签名意义:为了保证每个应用程序开发商合法ID,防止部分开放商可能通过使用相同的Package Name来混淆替换已经安装的程序,需要对发布的APK文件进行唯一签名,保证每次发布的版本的一致性(如自动更新不会因为版本不一致而无法安装)。你的采纳是我前进的动力,记得好评和采纳,答题不易,互相帮助,
2023-07-17 12:41:291

gar游戏文件,怎么用手机安装上????

安卓的?
2023-07-17 12:41:282

委托书范本精选5篇

  当你有事情不方便去的时候,可以委托别人帮你代办,那么,你知道该怎样写委托书吗?以下是我为大家精心整理的“委托书范本精选5篇”,仅供您在工作和学习中参考。   委托书范本(一)   委托人:_____ 身份证号:__________   被委托人:_____ 身份证号:__________   委托原因及事项:   本人因_______________________,不能亲自办理本人________________相关事宜,特委托___________作为我的合法代理人全权代表我办理相关事项,对委托人在办理上述事项过程中所签署的有关文件,我均予以认可,承担相应的法律责任。   委托时限:自_____年_____月_____日至_____年_____月_____日   本人签名(加盖红手印):__________   委托书范本(二)   委托人:_____性别:_____ 年龄:_____ 现住址:__________ 身份证号码:_____ 联系电话:__________   受委托人:__________ 工作单位:__________   委托人__________与_____纠纷一案 ,依法委托受委托人作为诉讼代理人。   代理权限为:   1、一般代理;   2、全权代理(代为承认、变更、放弃诉讼请求、代为参与调解、提起上诉、代领法律文书等)   代理期限:自_____ 年_____月_____日起至_____ 年_____月_____日止   委托人:_______________   _____年_____月_____日   委托书范本(三)   本授权委托书申明:我____________(姓名)系____________(公司名称)的法定代表人,现授权委托我公司的____________(姓名)为我公司代理人,以本公司的名义前来贵单位__________________(办理事件)。代理人在此过程中所签署的一切文件和处理与之有关的一切事务,我们均予以承认。   代理人无转委托权。   特此委托。   代理人:__________性别:______年龄:______单位:____________部门:_________职务:__________代理人身份证号码:____________   单位名称(盖章):____________   法定代表人(签字):____________   代理人(签字):____________   日期:______年______月______日   委托书范本(四)   甲方(以下简称为委托人):______________   乙方(以下简称为受托人):______________   经甲乙双方本着公平、平等、互利的原则下,双方达成委托销售房产的委托:   一、委托销售房产   乙方授权委托销售甲方客户全部房产且具有优先销售权。   二、甲方的义务   因甲方公司业务出现的客户房产,在客户同意前提下统一委托乙方销售,甲方保证提供的客户房产真实可靠,且享有房产的合法完全处分权。   三、乙方义务   乙方优先寻找提供适合的房产需求信息按照甲方客户规定交易价格方式销售,成功后收取1%(税后)的服务费。   四、低价部分约定   甲方客户同意前提下,低于市场价格40—50%的房产,乙方保证十天内办理好该房产的销售并且不收取任何费用。   委托期限:自_______年_____月____日至_______年_____月____日止。   甲方(盖章):______________   乙方(盖章):______________   ______年__月__日   委托书范本(五)   委托人:_____性别:_____ 年龄:_____ 现住址:__________ 身份证号码:_____ 联系电话:__________   受委托人:__________ 工作单位:__________   委托人__________与_____纠纷一案 ,依法委托受委托人作为诉讼代理人。   代理权限为:   1、一般代理;   2、全权代理(代为承认、变更、放弃诉讼请求、代为参与调解、提起上诉、代领法律文书等)   代理期限:自_____ 年_____月_____日起至_____ 年_____月_____日止   委托人:_______________   _____年_____月_____日
2023-07-17 12:41:271